Got me a couple problems

[Bad bow tie]

So for a while now my Tahoe has been pissing me off. It's a 1995 with 188,000 miles. When driving, and I start coasting with my foot barely touching the gas, it starts to jerk/buck back and forth. This is imminent at pretty much any speed, but more noticiable at lower speeds like 50 mph and below. Second, when the truck is warm it hesitates on take off. It doesn't seem to happen all the time, just when warm.

As of Monday 6/8, I have replaced:
AC Delco spark plugs gapped at .035"
AC Delco plug wires
AC Delco cap and rotor
AC Delco throttle position sensor (TPS)
Oil change with Mobil 1 and an AC Delco filter since I caught shit over on tahoe forum for using Fram.
Seafoamed it twice which helped out considerably with the hesitation but nothing for the jerking. (probably 2-3 months ago)
And I soaked the throttle body in carb cleaner a couple months ago...

I really thought this tune up would have cured it especially with the new TPS senor. It seems to have helped it but did not stop it. Plugs and wires looked fine but I decided to change them anyway. The cap and rotor looked like shit. All vacuum lines seem to be in place and secure. Other than this, it runs fine.

What do you guys think? I'm lost with it and getting really pissed off.

 

[Sepiroth]

You might want to remove your EGR and Idle Air Control motor. Soak them in carb cleaner and try to remove as much carbon as possible.

Without actually looking at the vehicle, this is the best I can do for now.

 

[jmildoc]

so soaking the egr does what exactly?

 

[Bad bow tie]

It is not stalling, never has. Sometimes when it hesitates it feels and sounds like it is going to stall but never has. This is especailly true when I'm in reverse. It sputters and feels like it is going to stall, but after a few seconds it jumps right back up. I'll clean the idle air control motor and see if that changes anything.

 

[Sepiroth]

Also clean the EGR and EGR passages.

Doing so knocks and gets rid of any built up carbon deposits that would allow the EGR tp remain partially open while it is not supposed to be, thus causing the bucking sensation.

But it could be other things as well. Doing what I posted would help regardless.

 

[bowtiefreak]

My vote is EGR, had that happen on my s-10.

 

[blueflamed03]

fuel filter been replaced?

 

[Bad bow tie]

fuel filter been replaced?

Yeah, I replaced the fuel filter like 1500 miles ago thinking that may have been part of the issue. No change. K&N air filter is also clean.

 

[malones99]

How exactly do you clean the EGR?

 

[clean454]

unplug the vacuum line on the egr start the truck and drive it, if it runs fine and smooth its the egr valve behind the air cleaner on the passenger side, mine was doing the same thing, ive have had it unplugged for like 6 months now lol just havent had the time to replace it, its simple and easy,

 

[Sepiroth]

9/10 times cleaning it will do the trick.

 

[AtomicHoe094]

i replaced my egr like 3 months ago. it was about 90 bucks i remember.. super easy to uninstall and to install.. not sure if your one of those people that it has to be replaced and not just "cleaned".. You pop any codes??

 

[malones99]

there isn't a vac line on my EGR? 99 Yukon OBS.

 

[AtomicHoe094]

should be..

 

[Bad bow tie]

I will take a look at it when I get home from work in a hour and a half. I ****** hate 10 hour days. I'll unplug to vacuum line and see if it runs any better.

i replaced my egr like 3 months ago. it was about 90 bucks i remember.. super easy to uninstall and to install.. not sure if your one of those people that it has to be replaced and not just "cleaned".. You pop any codes??

If I can clean something to fix it instead of just replacing it, you better believe I will. I am always game for saving money especially in this economy. And I don't have a check engine light on. Wonder if it even works...I don't think it's ever come on. lol

 

[AtomicHoe094]

mine would comon like 10 min of straight freeway driving only.. if i was driving around city for 5 hrs it wouldnt come on.. but yet i replaced the egr and its still on.. wtf.. lol.. but hmm
so try cleaning it out..

 

[clean454]

I will take a look at it when I get home from work in a hour and a half. I ****** hate 10 hour days. I'll unplug to vacuum line and see if it runs any better.



If I can clean something to fix it instead of just replacing it, you better believe I will. I am always game for saving money especially in this economy. And I don't have a check engine light on. Wonder if it even works...I don't think it's ever come on. lol

mines like 60 bucks on a 95 obd 1, the little diaphragm in mine was broken i just got a new one, i don't trust trying to fix old parts, i like just to replace it, but that's me, its just 2 screw and a gasket to replace it,

and yes there's a vacuum line you will see it clearly! behind the air cleaner passenger side good luck!

 

[AtomicHoe094]

the 96 and above vortec motors.. the egr is in the front i thought....... (fillmein)

 

[clean454]

the 96 and above vortec motors.. the egr is in the front i thought....... (fillmein)

yeah but bad bow tie has a 95'

 

["350Vortec"]

Wish i knew where the egr and air cleaner were on my 96 hoe, I want to clean mine. My truck seems to be doggy and sluggish when punching it at speeds over 50.