Since I know a lot of you guys suck pretty hard I knew this was the best place to ask.

Other than the Intake gaskets, Where else can I check for a vacuum leak that would cause a rough idle?

 

What kinda tune are you on?

 

Does yours have a fuel pressure regulator? OR is it return is it a return style fuel system?

 

My tune is in my sig. However the vehicle in question is 100% stock and has a mad leak somewhere to the point where it will barely stay running.
I'm still pretty sure it's the intake gaskets but I still have to buy some carb cleaner. It's for a coworker so I want to get all the options laid out before I do anything.


She said it does this every winter but is worse this year. Summer never has problems. That has me thinking gasket.

Dealership said the gaskets are good however I don't think they actually Sprayed them. They said it has a vacuum leak and just half assed it IMO.


Edit: BTW. unplugged MAF and ran fine the 1st time then started running ruff again. Maf on or off it's ruff

 

Ask around and see if you can get ahold of a smoke machine, they work wonders.

 

im boosted so im out.....










A stock vehicle, I really dont see gaskets just going out.

 

well I actually have 2 co-workers with seemingly the same issue. both over 130k miles.

 

what kinda vehicle(s)

 

03 Sierra 5.3, 02 Tahoe 5.3

 

Unplug the vacuum line from the fuel pressure regulator, and start the truck, if fuel leaks out bad deal, could cause a rough idle since fuel is getting sucked up. Also spraying the intake down can work. But smoke works better, i have also seen 1 or 2 randomly cracked intakes as well, but those where more the early 99-00 trucks.