Need some advice

[2002 v6 camaro uncharged]

I had this post in the Gen Tech for a few days with no respones and since I am supercharged I thought maybe I coud get some help here.

I have put in 3 different MAF sensors that were remanufactured, I tried a new Cardone Select sensor. My final resort is to try one from the dealer. But now I am starting to wonder if it is my MAF or not. Right now I am running in speed density mode with the MAF unplugged and it is running great, plug the sensor back in and it runs like ***.
Today I decided to turn up my onset of boost adjustment on my FMU a little so while the car was at idle I popped off the vacuum to the FMU.
I noticed the idle got a little smoother so I plugged my MAF sensor back in and the car ran alot better. Then I replugged the vacuum line back into the FMU again and the car ran horribly and wanted to stall. I have thought it has been my MAF sensor all this time but maybe it is something else.

I have visually checked my vacuum lines and they look okay. I have been having problems with this for 6 months. It has progressively gotten worse, I started out with just a slight stumble at idle in the mornings so I think the FMU and the vac line routing are fine. This is my second FMU, I replaced the original one becasue I thought that might have been my problem but I was wrong again and this problem was not there when I originally installed the supercharger.

I do hear a hissing noise coming from around the driver side front of the engine but I don't know what could be leaking there that would cause this problem. There is no vacuum lines in that location that tie into the FMU.
Any ideas?

[Shirl]

Take the FMU out if your only running 6psi. Put your Maf sensor back to stock. Have you looked at your plugs? If the car's missing, they might be fouled from running too rich. The FMU is most likely the culprit. I'm not sure what the "hissing" from the motor could be though.. must be a leak from somewhere. Are you using any kind of program to do some readings?

[2002 v6 camaro uncharged]

Nope, do not have any programs yet. Saving for HP tuners though.
I am running 8.5-9.0 PSI. The car is not missing with the stock MAF unplugged only with it plugged in does it run like crap. The car has run completely different with every MAF sensor I tried.
The first one ran fine except for a slight rough idle from a cold start but after that it ran great but it kept on throwing the MAF code, with the second one the car would not even idle it would just die after start up and never threw a code, with the third one the car ran the same way as my original one just 3 times worse and never threw a code, and the forth one ran exactly the same as my original one.

I don't think it is the FMU because even though it runs better with the vacuum line off the FMU I can plug the vacuum line with my finger and the car runs just as bad. The FMU is a brand new Fully adjustable Cartech and this problem started with the fixed FMU that came in the supercharger kit.

I have changed the plugs, wires, coil packs, had ICM tested, Fuel filter, and Fuel pump. The only thing I thought that it might be would be an injector. But I can not understand why it runs so good with the MAF unplugged. You would think that if it was a fuel injector or a vacuum leak it would run bad no matter if the MAF was plugged in or not.