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Old 08-17-2018, 09:43 AM   #5
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Join Date: Nov 2010
Location: Los Angeles
Posts: 7,518
Originally Posted by ZoomGlide125 View Post
P0300 - Misfire damaging to cat. converter and

The last time I fired it up it gave me:

P0300 and P0304-P0306
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.
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
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