My car idles fairly well after all the tune ups i have done so far. It also is ok at high rpms very smooth but at around 1500 to 2500 which is like light accelration/gas the car shakes and rumbles more idk if it hasto do with the supercharger bypass or something because ive alos notice that it stops when the boost reaches 0 and beyond. So it only does it when the boost is negative anyone else expierence this?

Normal? No.

Vacuum leak? Coil pack?

I'm thinking a vaccum leak.....Especially if it'* only doing it when there'* vaccum in the system, and stopping when it'* hit = pressure.

What does a normal coil read for resistance? So the vacum hasto do with the boost? It only happens sometimes though. It didn;t happen today it felt fine but the day before that it would shake the car alot and u could feel it was uneasy.

I think techinfo has the details on coil specs. But if it'* intermittent, it could be a bitch to diagnose bad coils. Could be heat makes them bad.