Good call......Did not even think about that.....I think you are 100% on with that diagnosis.

 

OK, that was my next guess, intake gasket. I wish someone would have told me that you can't detect an intake gasket leak with carb cleaner, I would have changed it first. I've read that those go bad and cause those 2 codes. Now, exhaust leak, wouldn't an exhaust leak cause one code not both??
I did run some injector cleaner right after I got my codes. I have a vacuum gauge and am going to check my lines once again, 5th time.
You brought up a good point on the regulator lines, I'll check those after a good ride to see if I have fuel around there.

I'll post something tomorrow after I do everything.

Thanks
Art

 

OK I just changed out the intake manifold gasket, no luck.. same trouble. I did notice some fuel from one of the fuel lines near the drive side fuel rail. Going to change the "o" ring there and the exhaust gaskets. Will post results later on today.

 

That's the FPR then.....pull the vacuum hose on it and see if gas is in the hose, if there is you've got a bad regulator (~$90)

 

Changed the exhaust manifold and the "O" ring on the fuel line...... No luck. Going to try to order an Fuel Pressure Regulator. Does anyone think that it could be the ECM????

 

i have also seen these codes set from the seal on the master cylinder where it goes into the brake booster. pinch off the big vacuum line and see if your codes will clear and stay gone.

 

Changed the FPR and Fuel Filter...... No luck... Dawm this is getting crazy... If I put my foot on the brake pedal and give it gas (Under Load) it wants to stall. I don't get it...

 

have you ever checked the fuel pressure to verify the correct pressures?????? and a off the wall suggestion....is the oil cap on the engine, and tightened correctly....believe it or not ive seen this cause lean codes on occasion

 

You are either getting unmetered air or you maf is not working properly. Check the little wires in your maf sensor for carbon or debree build up. Cleaning the maf with choke cleaner or electrical contact cleaner works good, but it is not condoned by gm. You can check for build up on the wires inside the meter by using a small mirror and a flash light. Then you should check your intake for cracks, I have seen a few cracked intakes lately. You can use choke cleaner to check for intake leaks if you unplug the IAC valve first. Has it ever set a p0102?

 

im with bigbadwolf54. i saw this just the other day when our oil changers forgot to reinstall the oil cap. i just forgot about it.