odd p0102 code

[myzerman]

I have a 2003 grand prix gt with a NONsupercharged 3.8. It was throwing 4-5 codes about a month ago... I replaced the parts called for and then some based on other forum research, including, O2 sensor, MAF sensor, plugs, wires, and cat converter... until I discovered a hole melted in the intake manifold. Still don't understand how that happened. But anyway.
I replaced it and had to re-replace the cat converter b/c it burned up and threw a code from being driven with existing problems.
Everything was fine for about 1000 miles. Now the car barely starts and will only run at an idle or slow acceleration for a few minutes, then stalls. If I unhook the MAF sensor, it runs down the road, but not efficiently. I have check the major vacuum lines and the throttle body intake hose and don't see anything obvious. I do not think it is a MAF problem, just something else disguised as one.
Please help!

[richtazz]

If you bought a reman MAF sensor from A-1 Cardone, it's very possible that it could be bad again as that brand is questionable at best.

From your symptoms, I would have the fuel pressure checked, as it sounds like you're running very lean which caused the cat to burn up (if was even bad) and the hole in the intake manifold. When you had the upper plenum fixed, did they also change the lower intake gaskets? They are a fairly common issue on these cars and could be another cause of your symptoms, especially if you're mysteriously losing coolant. Bad intake gaskets can cause an internal coolant leak which can get in the converter substrate and ruin a new converter, and also a vacuum leak which will cause driveability issues.