Quote:
Originally Posted by ZoomGlide125
P0300 - Misfire damaging to cat. converter and
P0301-P0304
The last time I fired it up it gave me:
P0300 and P0304-P0306
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First, misfires on cyls 1-3 and cyl 4.
Then, misfires on cyls 4-6.
The most common cause of misfires are coil packs, spark plugs, air leaks, MAF, and/or engine sensors.
The hunting idle does suggest an air leak but you said that the car actually backfires which implies a timing issue and that is usually related to an engine sensor problem.