5.3 Slipway while driving

[S33k3r]

ok, i will explore this trail. I will watch some youtube videos to see how to replace my intake gaskets

I'd further suggest you research testing this theory so you aren't just throwing parts -- and your time!!! -- at an unknown problem. I just suggested the gaskets based off one of the answers you had already received. I *so* understand these problems that you just want GONE.

 

[rockola1971]

Just spray some starter fluid around intake gasket while engine is running. If the idle jumps all of a sudden while you are spraying starter fluid it means there is a leak at the intake manifold gasket and that leak just sucked in unmetered fuel (starter fluid) which caused the idle to jump up.

 

[Spacido]

yes it's a good idea. I hope to find the cause of my problem

I will give the results

 

[Fless]

Just spray some starter fluid around intake gasket while engine is running. If the idle jumps all of a sudden while you are spraying starter fluid it means there is a leak at the intake manifold gasket and that leak just sucked in unmetered fuel (starter fluid) which caused the idle to jump up.

You can use a variety of sprays: carb cleaner, etc. Propane also should work.

 

[Rocket Man]

Following

 

[Spacido]

Hello,

First of all, I haven't tried the spray yet.

My tahoe had a very unstable engine idle and I had two codes:
P0171 mixture too lean bank 1
P0300 Random/Multiple cylinder misfire detected
the second code, I didn't have it before