engine perfomance

1987 CHEVROLET CORVETTE
123,000 MILES • V8 • 2WD • AUTOMATIC
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NYVETTE
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i have an 87 corvette 350 ho the engine was shuddering badly at 55 mph n about 1200 rpm i change cap rotor plugs n wires it did help tremedously but still slight vibration at 55 1200 rpm it will clear if i punch the throttle a lil
Apr 23, 2011 at 10:22 PM
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RASMATAZ
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Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.
Apr 23, 2011 at 10:25 PM