Startup Hesitation and Stalling

[lumberjack890]

When i try to turn on my Yukon it hesitates to turn over. When it does the RPM's dip below 500 and either stalls out or feels like it wants to stall out

Im guessing it's a weak fuel pump but I always hear it prime before starting it up

Any suggestions are greatly appreciated. Rather take care of it now rather than later


2001 GMC Yukon 5.3 V8

 

[Doubeleive]

Try cleaning the throttle body and maf, both can be a cause of your issue

 

[lumberjack890]

Try cleaning the throttle body and maf, both can be a cause of your issue

Already did.
Im thinking about cleaning the EGR Valve

 

[Doubeleive]

Already did.
Im thinking about cleaning the EGR Valve

possibly, if you have a IAC valve try cleaning that too they usually get pretty gunked up inside and that can make it not idle correctly
what is the mileage?

 

[lumberjack890]

possibly, if you have a IAC valve try cleaning that too they usually get pretty gunked up inside and that can make it not idle correctly
what is the mileage?

Good idea
287k

 

[Doubeleive]

have you ever replaced the maf? if it has never been replaced it is far past it's average lifespan, just something to consider a scanner that can read live data may be helpful to see what the maf is doing.

 

[lumberjack890]

have you ever replaced the maf? if it has never been replaced it is far past it's average lifespan, just something to consider a scanner that can read live data may be helpful to see what the maf is doing.

Thanks m8
Appreciate it

 

[Doubeleive]

is there any check engine light or codes coming up?

 

[lumberjack890]

is there any check engine light or codes coming up?

Sometimes. The only code I've seen was P0300 (Random/Multiple Cylinder Misfire)

 

[Doubeleive]

when you get it figured let us know what it was for future reference.