Let'* start with easy and free.

You changed out the coils. Did you happen to lift up the ICM, clean both it and the mounting plate (add a light layer of dielectric) before tightening the new coils down?

Give this a try. The ICM to mounting plate is a ground that is critical to the coils and ICM functioning properly. (And I have a little experience here myself )

Check fuel pressure and scan for any codes. Most sensors do report back and set codes. You can have a code w/o settting a check engine light.

My bonneville is done :( how i loved it but the tranny shop wants $1600 to rebuild the tranny and the blue book price is only$1400. I lucked out though I found a dare i say the words 2004 Grand prix for $11,000 with 35,000 miles on it.

The tranny shop says the bonneville needed a complete overhaul 3 sensors were bad,some sort of rod and chain needed replaced and too many other things to mention.
:( :( :(

Well, that just sucks.

Too bad about the Bonne, too....

I wish I remember how much my tranny cost. All I remember is it was about 4 grand for the engine and tranny (and labor of course)