Guys I have a 1991 tbi 350 that when in gear and at an idle the tach starts bouncing up to about 2000 rpm but the engine isnt surging. As it gets warmer and does this the engine seems to miss a little. Just replaced entire distributor, tps, knock sensor, cleaned main ground and added a ground directly to the starter. Wasn't doing this before i replaced the distributor. Could this be something to do with idle air control valve or the coil??? Help please!!!