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What would cause my 1994 GT to have a major shake/vibration whenever the accelerator pedal is released? The engine and body both shake severely and then dissipates with 10-20 seconds. I believe it is either an ignition, engine control or fuel system issue.
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I have a 89 GT. When it gets to a crusing speed of around 70 it starts to vibrate. I can feel the shifter vibrating realy hard as well. Its only when i am at a speed of over 70 or so. When its getting there it seems to be smooth, but once it plains out at that speed i have this problem. I did have a plug put in the back tire and also changed my gears to 3.73. I cannot figure it out
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