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I have a Honda Passport it loses power under excels rating and backfires under decelerating and we have ruled out the catalytic converter being stopped up

\015 My Honda Passport in running very rough and it loses power under ex celebrating . then when I decelerate it often backfire. I ruled out the catalyctic converter today so now I am stumped. please help!\015 Posted / edited by AnonymousUser on : 22-01-2018

Answers :

Timing plugs or leads or could be exsesive fuel
leaking valves
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