We're here to help, but it PAINS me to see someone spend money!

Promise me you won't buy anything else until we're sure about your problem

Ok. Nothing else. I'll still get the last coil, though. 2 made a differance in other things, especially responsiveness. I'm not sure that the shudder really decreased all that much. At 55/60 it happened when the RPM guage kicked down to about 1700 but it was very subtle. Today on the way in at 65/70, it was pretty close to as it had been when it kicked down to just above 2000. I'll see if there are any new codes when I pick up the last coil pack.

I know I need more precise numbers from a scan tool to show more. One of these days there will be a great deal on eBay.

Well its a 1994 Pontiac Bonneville with the 3800 , and is not supercharged. I also found out by the lady that used to own it has had 7 alternators put in it since she bought it brand new in 94(is this normal?)not counting the baterries. I dont know if this has anything to do with it? I was told to unplug the the battery for a few minutes and then plug it back up but the only thing this done for me was locked my stereo. Most likely you can tell im not a big "mechanic" when it comes to cars, so i dont know what to do. Im gonna try to find a place that do the scantool thing. Does autozone do it? oh by the way the car mostly does this going up hills and at low rpm'*. when u are goin around 40 m.p.h and up

Well Im sorry to everyone that tried to help me with my problem, and i didnt reply. I ve not had a working computer in forever. But anyway.....

I changed the spark plugs and wires and now its fine! I guess next time ill try a tuneup to ssee if thats the problem

Thanks to all that tried to help me.