99 pontiac grand am vibration?

  • Thread starter Thread starter cgdicamillo
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cgdicamillo

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I have a 99 pontiac grand am, when the vehicle is in the drive position it vibrates. we thought spark plugs, changed them, check the motor mounts, those were good. any suggestions/ideas to whats the cause?
it's only happening during an idle postion while its in drive, could it still be the rotors then??
 
You changed the plugs but what about the wires you may have an intermittent skip or miss. You may also have a weak fuel pump or clogged filter.
 
rotors. One too many brake jobs without having them turned will cause vibration. As the brake pad lining deteriorates, it puts A LOT of heat on them, causing them to warp. Also, if the pads ever were completely gone, you could have warped them. I would check this out.
 
ok if you were slowing down from speed then i would say its the rotors but if your at a stand still and it shakes, first off what plugs did you get, never get anything other than ac delco plugs for that car. autolite champion and all those others work but they dont work as good as the oem parts. try the spark plug wires after that.try that first then get back at me
 
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