Hello again,

I am experiencing a really weird problem with my 96 Bonneville SE with about 102k on the odometer. When i go off to school in the morning, after the car has been sitting for the night, and i get onto the expressway, between id say 45 and 60 miles per hour, the car starts to like shutter, its like a jerking reaction. When i let up off the gas a little, it will stop, when i get on the gas more, it starts doing it. Now once im crusing at 65, the car is fine. and even when i slow down and speed up, its fine. It seems to only happen when the car is starting to warm up, during acceration. I also notice that when i start driving it when its cold from a stop light, it does the same sort of thing... its like a slight hesitation. I honestly do not think its related at all to the transmission, because it seems to shift just fine, otherwise. It has plenty of power in it, and like i said, once ur driving, it goes away....Any suggestions, what might be wrong? is it expensive to fix? I have a 91 Bonneville with 151k, and it doesnt do this at all. Thanks again....

How old are your plugs and wires? How long since a full tuneup? Anything like this usually requires a full tuneup and a PCM scan first. Then go from there.

Same thing happend to me about a year ago. It was a bad plug wire. If it'* been a while since you've changed them. I'd do it anyways, it'* can't hurt, and they are pretty cheap.

Is the shudder almost like the car is bouncing around a bit? I seem to have the same problem around highway speeds when I am braking.

Classic case of warped rotors. It'll get worse if you heat 'em up good.

Trust me. I've been through warped rotors on this car twice now.

The shudder problem is USUALLY plugs and wires.

I honestly DO think this is related to his transmission. I agree with all of you about making sure that the car is properly tuned with new plugs and wires. When was the last time the transmission oil and filter was changed? I think if you change(or better yet Flush) your transmission oil AND change the transmission filter your problem may go away or at least be less noticeable.

Here'* some info on Transmission(or Torque Converter) Shudder.
http://www.c2c-auto.com/what_is_torq...er_shudder.htm

I have to agree. If I were you I'd take the car to get it "wintered". New oil and filer, some new plugs and wires, etc. Also you said it happens when its cold too. Dunno if lack of antifreeze would do it too? liquids is my weaker point

Get a complete overhaul done if it has been awhile since your last tune up.

Sorry to take over the post a bit, but how much do rotors cost to replace?

So,

You guys seem to think its transmission related? thats strange, after i have been driving the car for a few minutes, when its all warmed up, its shifts just fine, has plenty of get up and go.... i was thinking to, the spark plugs or wires, cause it seems like the engine is skipping or something....Im going to have my mechanic check it out. what would you reccomend doing if it is transmission related? complete flush and fill? Does this mean my transmission is ruined? it only has 102k on it...i have a 91 Bonneville with 151k, and its never done this.... I just bought this car in May, so i havent really dont much to it except for oil changes...i dont know when it last had a tune up...any other advice would help......