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Cobra Forums
2013-14 Shelby GT500
Random misfire P0300 code
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<blockquote data-quote="Robot_trainer" data-source="post: 15409032" data-attributes="member: 157423"><p>Just my experience with this...for some reason my engine did not like the NGK BREF7 plugs. I tried various gaps from .028-.034 and kept getting a random stumble until it finally threw a code. I replaced them with equivalent NGK V power plugs and it was better but still had faint skip and threw another code after a few weeks. I finally went back to the Iridium plugs gapped at .034 (Autolite XP103) and it now runs great. Smooth, no pinging, no missfires and no codes. This is with the CAI and larger throttle body and corresponding tune.</p></blockquote><p></p>
[QUOTE="Robot_trainer, post: 15409032, member: 157423"] Just my experience with this...for some reason my engine did not like the NGK BREF7 plugs. I tried various gaps from .028-.034 and kept getting a random stumble until it finally threw a code. I replaced them with equivalent NGK V power plugs and it was better but still had faint skip and threw another code after a few weeks. I finally went back to the Iridium plugs gapped at .034 (Autolite XP103) and it now runs great. Smooth, no pinging, no missfires and no codes. This is with the CAI and larger throttle body and corresponding tune. [/QUOTE]
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2013-14 Shelby GT500
Random misfire P0300 code
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