Just put my 5.0 back together after installing ported E7's and have been having cold idle problems since. I thought it might be the TPS or Idle Air bypass, so I checked them both. TPS was set at .985 volts with throttle completely closed, 4.6 volts completly open. Then I started car with the idle air bypass disconnected and after it warmed up set the idle at 850 (I'm running an F-303 cam). At this point the car was idling fine. I shut the motor off, reconnected the IAB and the car would not idle! I went throught he whole routine again and had to really crack open the throttle to get it to idle at 1200. Reconnected the IAB and the idle shot up to 3000. The car hauls ass at full throttle, but has a slight miss at cruising speed. I've swapped the mass air meter with no improvements. The intake is a GT-40 w/24 lb. injectors and fuel pressure set at 36 psi. I'm running out of ideas, somebody help!