my car is vibrating when it is parked with the engine on, and when i accelerate between 2-3k rpm's it gets worse but seems to stop after the secondaries open up. It will continue to stay bad no matter what speed the car is at if the engine is not revved hard, my mechanic thought it was the ignition coil, they replaced it and it did nothing so now they are going to see if it was one of the other coils, anyone got ideas about what it might be? (the car just got off a 700 mile trip last weekend, and was not driven again until thursday morning - and hasn't been driven since)