Ok, so when im at a stoplight, sometimes after driving around a while, at a complete stop, the car sometimes feels like it wants to die. Like if i dont keep the revs up, itll drop. I gotta play with the brake and the gas. and sometimes when the motor is warm and its in park and i rev it high, the car just dies after the rev's drop down. My only mods is a K&N FIPK, Mac O/R H pipe, and flowmasters. It was a swapped motor. Came from a 96, GT, my car is a 98 GT with an auto and shift kit. And also sometimes when i shift into gear, the shift locks so hard that the motor almost dies. One time it died when i was reversing out of my driveway. I cleaned my IAC, changed my TPS, and cleaned my MAF element. Im lost right now. Anyone can help me as to what to look for? Thanks !