1989 Pontiac Bonneville Car Shakes Only Constant Speed Away Accelerate Let Off

1989 PONTIAC BONNEVILLE
135,000 MILES
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My car shakes only at a constant speed but goes away when i accelerate or let off the gas. Also it's not getting full power like it should. i just replaced the starter,plugs,wires and harmonic balancer within the last month. Tomorrow im goin to check my plugs and wires so i only hope thats what it is, if anyone has a guess what it is plz tell me. thank you
Dec 19, 2012 at 6:01 AM
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ASEMASTER6371
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you said you just replaced the plugs and wires??????

check fuel pressure and back pressure from cat converter

Roy
Dec 19, 2012 at 11:44 AM
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