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What is wrong with the engine in a 1990 Pontiac grand prix if it still misfires when you replaced the plugs and wires?
Wiki User
∙ 18y ago
What size engine? 3100 motors are fairly common for fuel injectors that need professional cleaning. Ignition coil pack may be another source, coolant getting into the cylinder. When you pulled the plugs out which cylinder had the black carbon build up? That is your troubled area.
Wiki User
∙ 18y ago
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