05 tahoe low idle/stall

[Lit549]

I've searched and searched,found a lot of threads related to this but no answers..My 05 tahoe (5.3) has developed a low idle,it happens as I come to a stop..It dips down to about 200rpm but doesn't die,then it clears up and won't happen again for awhile.Fuel pump has 52psi at idle in park.Fuel pump is original.I have cleaned the throttle body and map sensor..No light!I read somewhere it's the throttle body and needs replaced?Anyone have this issue and a answer?Thanks in advance

 

[cmc76]

any codes? sounds like a symptom of intake gaskets.

 

[Lit549]

No codes,I did the knock sensors aboutb2 months ago,replace gaskets then..Had no problems till now..I also sprayed around intake and no leaks.

 

[Lit549]

No codes,I did the knock sensors aboutb2 months ago,replace gaskets then..Had no problems till now..I also sprayed around intake and no leaks.

 

[cmc76]

i would try the throttle position relearn next. its a series of key cycling, i dont recall the exact procedure though.

 

[Lit549]

I'll Google it and try it,I'll post results.

 

[01ssreda4]

Id replace the tps if you are just going out on a whim. They will cause funky idle fluctuations like you describe.

 

[cmc76]

i suggested the relearn over throwing parts at it, at least its free. After a relearn, i would try a MAF and TB cleaning.

 

[01ssreda4]

There is no reason for a relearn unless something else is wrong. A relearn just sets a low and high voltage to cover the span of 0-100% throttle. If this has changed enough to cause an issue then the sensor is likely failing. A relearn will simply mask it for a while.

 

[cmc76]

true. im talking free and quick until he can scan