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Old 08-17-2018, 09:43 AM   #5
thstone
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,518
Quote:
Originally Posted by ZoomGlide125 View Post
P0300 - Misfire damaging to cat. converter and
P0301-P0304

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.
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