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Old 06-11-2020, 03:21 AM   #1
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Join Date: Jun 2020
Location: tampa florida
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rough idle and cel codes
I recently replaced the heater control valve and OAS while i was in there. The car ran fine for about a week. now throwing 300, 302, 304, 306 misfire codes. can anyone give me an idea what to look for. cannot find any vacuum hoses loose.

2003 Boxster S
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