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Cly misfireing

(2001 Buick LeSabre)
in East Hartford, CT on January 30, 2010
I PULLED A CODE OF THE COMPUTER PO300 RANDOM/MULTIPLE CYL MISFIRE DETECTED. CAR HAS 120K. SERVICE ENGINE LIGHT ON.
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Popular Answer
on January 30, 2010
Get it fixed asap, could be leaking coolant in to engine through leaking upper intake manifold. Check your coolant level in overflow bottle and radiator (when cold) to verify. If it is a leaking intake could cause engine to hydrolock and more severe damage will result.
on January 30, 2010
Check this out: http://repairpal.com/OBD-Code-P0300
on April 07, 2010
I just had simular problem. Was the ignition control module. Runs great now. No misfiring.
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