SHAKING AND SHUTTERING ON IDLE
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1991 Mazda MX-6 Question: CAR TROUBLE
Answer #1patrick mannion from Greg Solow's Engine Room, June 27, 2009, 19:54Master
Shaking and shuttering can be caused by mechanical (engine related, a large vacuum leak, burned valve ect....) spark related (loss of ignition due to bad spark plug, bad plug wire bad distributor cap or failed coil in the case of DIS ignition) or it could be fuel related, a fuel injector could have failed or is not being triggered to fire by the computer.