2004 Pontiac Montana what can we do and how much is it goin

Hi Brucevh. Welcome to the forum. Can you elaborate on the symptoms? What speeds does the shaking occur? Does it stop if you let off the gas? Do you feel it in the steering wheel, seat, or both? Any details will be helpful.

Was anything repaired recently? New tires, brake job, etc.

caradiodoc

Car at a stopped position,when car is excellerated will either jerk forward or shutter then it goes away. It may not occur again for aweek or less. Tires were replaced last month but since we arent moving I doubt if thats the problem. car has 130000 miles on it

Without being able to experience the shudder, it could be related to an intermittent engine misfire or slippage in the transmission. If it is engine-related, your mechanic can connect a scanner that will display sensor data during a test drive. When the problem occurs, he can press the "record" button. Since the data passes through the scanner's memory, the recording actually begins a couple of seconds before the button is pressed. The data can be played back slowly later and examined for telltale clues to the problem.

caradiodoc

I asked a friend concerning this problem and he thought it was the transmission,something about a solenoid inside transmission, could this be the problem it seems to be only on a fast take-off from dead stop. we can't seem to get it to do it all the time.

Yes, it could be related to the transmission, but instead of the solenoids and valves, I think I'd look first at the type of fluid that is being used. The wrong type of automatic transmission fluid can cause weird symptoms while not causing other permanent damage. If certain friction modifier additives are needed but missing, chattering of the clutch plates can occur as they try to engage. Do you have a transmission specialist nearby? They often know the answer after a short test drive.

caradiodoc