Rough idle /need help !!

[Luis Ramirez]

I own a 03 Suburban with about 118,000 miles on it .About a month ago I performed a major tune-up replaceing all spark plugs& cables , etc. But Recently, I've noticed a problem arise as while coming to any stop ,the RPM drops from about 1,000 to 600 & goes back up. It feels as it has a moment of rough idle while experiencing the drop but goes back to normal. Any ideas on what could be the solution to this ?

+ QuoteReply

 

[hepp04hoe]

intake manifold gasket? mine was idle rough or when came to stop it'd kind of stutter. tool sprayed some carb cleaner around intake and sure enough it increased engine speed. changed gasket been fine since

 

[Boostedlsx]

Does idle only drop once when u stop and then return to normal until next stop? Also no power loss or hesitation under load? Hows it start on a cold start?

 

[Luis Ramirez]

Does idle only drop once when u stop and then return to normal until next stop? Also no power loss or hesitation under load? Hows it start on a cold start?

Yes it drops and then goes back to normal until next stop like you said . There is no powerloss or hesitation under load . But Also in a cold start it seems to be pretty shakey .

 

[Luis Ramirez]

intake manifold gasket? mine was idle rough or when came to stop it'd kind of stutter. tool sprayed some carb cleaner around intake and sure enough it increased engine speed. changed gasket been fine since

How would I happen to clean out the intake ? Would I also consider the throttle body?

 

[hepp04hoe]

How would I happen to clean out the intake ? Would I also consider the throttle body?

don't clean it just it there's a leak in gasket it will suck in the clean thus making engine speed increase.

 

[Boostedlsx]

I would pull intake tube and clean throttle body. And as said spray with carb cleaner for vacc leaks check hoses and intake gasket.

 

[hepp04hoe]

your description sounds same as I was having. intake manifold gasket and few hours later it runs like new

 

[Luis Ramirez]

I would pull intake tube and clean throttle body. And as said spray with carb cleaner for vacc leaks check hoses and intake gasket.

-Tried this & bam! Truck feels new again . Thanks for the help tho

 

[Tahoebigdog03]

Had same problem, but spayed some tb cleaner and cleaned K&N filter and seems to be back right. Keeping fingers crossed