Helppppppppppp 95 yukon surge at idle after 10mins

[cburns002]

Help i have a 95 yukon that has been running fine.. Recently replaced fuel filter and egr valve. And done a complete tune-up.. Started to idle krazy with surges.. After it sits a few days its fine... Wut can it be.... Checked for vaccumm leaks.. Good fuel pressure....

 

[BigWheelinBubba]

I would guess IAC (idle air control) or possibly a bad fuel pressure regulator.
Also maybe a throttle body gasket leak as the bolts on my old truck actually backed out and were finger tight at one point. Changed the TB gasket and was good.

 

[cburns002]

Ty will check those out also..

 

[SunlitComet]

well by 10 minutes you would be in closed loop mode so examine the data on iac control and O2 outputs.

 

[retorq]

It's a 95, light it on fire.

 

[cburns002]

Well changed the iac and still the same thing.... Any other suggestions beside "setting it on fire" lol

 

[SunlitComet]

Did you get it to relearn too?

 

[cburns002]

yes... now if i hold the pedal at 2000 rpm to idle it will start to surge like its not getting any gas. the same thing when i try to drive the truck...

 

[SunlitComet]

how and where did you measure fuel pressure and what was the reading?

 

[cburns002]

dropping it off tomorrow at shop so they can check the fuel pressure.. was trying my best to do whatever i could myself b4 taking it to someone else