This past weekend i got my speed daddy headers in, installed, and welded my hi flow cat in. On the first start up it took quite a few cranks to get it to start up. After it started up it was idling fine. I tried to rev it up a little and as soon as I pressed the gas it started to stutter like it was misfiring. The aeroforce didn't detect any misfires and I had no codes. If i feather the trottle it will throttle up fine, but any more it will "miss" all through the rpm range. Same thing happens when i try to drive it, hesitation at all rpms but idle. Another odd thing is when i get above ~3500 rpm the vacuum line hooked up to the MAP sensor comes off and is the only time i throw a code which is P0068. Other then that no codes.
I checked the plugs and wires and they all seem fine. I looked around for any disconnected wires, and everything was good. I cleaned the MAF and throttle body. And while installing the headers i broke the EVAP purge solenoid, but I wouldn't think that would cause this problem, I have the part on order.
this car is a 2005 comp g that has a s1x cam, 3.5 pulley, intense pcm, fwi, 180 stat, zzp wires and autolite 104s (that were both installed less than a month ago), and now sd headers with hi flow cat. Thanks in advance for and advice given.
