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car breaking up at 5500 and up

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enriquez2000

Proven Member
2,411
1,020
Oct 5, 2014
fort collins, Colorado
car drives fine around town and up to 5500rpm.. but at wot it starts sputtering from 5500 and up. Tried plug gaps from 28 down to 17, afrs stay in line with what they need to be with e85 between 12 and 11.5. Tried fresh plugs and wires are not old at all(few months)

Any other ideas of what to check? I would think if it was the coil starting to go bad Id see it in lower rpms too.
 
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