Intermittent Misfire and Engine Bucking
My 1995 Oldsmobile Cutlass is bucking on acceleration. Compression OK 150 all around,fuel pressure (42psi), new fuel filter, replaced ignition wires. Most noticeable on easy acceleration after torque converter lock up.....thank you.
Most of the time a misfire under load like this is caused by an ignition problem. Usually a plug wire. Since they were replaced, i would suspect a cracked spark plug. Remove them all and inspect them. Look for a crack in then porcelain, or signs of carbon tracking. I would assume the ignition coils looked OK when replacing the wires. If all plugs are OK, then this could also be a possible transmission problem. Acceleration with TCC lockup may cause the TCC solenoid to be shuddering if it is faulty. It should kick off on accelerate.
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You think I should try plugs or trans filter first? Thanks in advance for your help.
Many things can cause an idle problem. A vacuum leak, carbon in the throttle, a bad sensor etc. Accelerating when at a steady speed could be a bad throttle position sensor (TPS). Have the codes scanned- that may give direction as to what needs repair. Unless the engine and vehicle speed are not actually going higher- then maybe a bad dash gauges cluster.