00 Camaro Backfire/Fuel Issue?
 

Hey guys, this past week I bought a camaro from Oklahoma. The car has had this done to it by the previous owner and this issue did not start until the build was done.

LS6 Intake/TB/MAF
Longtube Headers, full exhaust (Front o2 sensor is 2.5" away from block on cylinder 1, back set of o2 sensors are tuned out) No Cats Stock Y pipe
4L65e Kit, with an insane shift kit.
New Crank Position Sensor
Frost Mail Order Tune
5.3L "862" Heads


Sometimes the car will not start it will crank for about 4 seconds and backfire through the exhaust. Also the car is running extremely rich, any ideas or comments would be greatly appreciated, I am stuck at the moment!


Yesterday I removed the MAF and cleaned it very well. Car has more power now, but still cutting out occasionally.

Just scanned the ODB2. Below are the codes it is throwing, although there is no check engine light??

P0300- Random Misfire Detected
P0151-o2 Circuit low voltage bank 2 sensor 1 (guessing this is because the back o2's are tuned out)
P0102- Mass or Volume Air Flow Circuit Low Input


any advice would be much appreciated!

Just pulled intake, I seen the stock ls1 crossover coolant lines underneath, the intake has been shaved to achieve this. Really stuck here any advice would help!

After I installed the LS6 coolant tubes, and new O rings on the injectors it has helped alot no more rich smell (#7 injector wasnt seated down all the way) However I still have an issue with the hard start occasionally. Recently I have been turning the key on and off 3 times before starting it and it has helped. It starts about 95% of the time when i do the sequence. However what causes this fuel pressure bleed off (i am assuming this is what is happening).