Electrical problem
1997 Buick Lesabre 6 cyl Front Wheel Drive Automatic 100000 miles
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My Buick developed a missfire and the check engine light came on. A check with a code scanner showed a po 0300 code ( random/multiple cylinder misfire detected).
I changed spark plugs and plug wires, but still have the miss. Can you shed any light on what else would cause this code? I am new at working on computer systems.