Dealership Can't fix my problem :-(

[Sephitrask]

Originally Posted by LunchboxCritter

Did they replace the counter weight when they replaced the flywheel with a light weight one?

I would think that it would be VERY obvious if they did not put on a counter weight. If I remember correctly, the counterweight is actually a part of the stock flywheel, so if they just put on a flywheel and no new weight at all the engine would prolly run like crap.
Definitely sounds like a vac leak, or something not plugged in right. Start at the front of your engine bay and check every connector to be sure they are connected correctly and completely. Then follow every vacuum line, making sure they are connected at both ends.