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Ok I saw the other posts while I was typing. Last thought would be to not shift until at least 4.5k and get your car off that knock sensor. At those RPMs and low quality fuel your timing could be retarded from lugging the engine. Lugging this engine is worse than revving it up due to load on the engine.
Cats are catalytic converters.
Last edited by 911monty; 08-03-2015 at 05:21 PM.
Reason: previous post
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