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Rough sound like a motorcycle accelerating between 40 and 60 mph.

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04 Ford Expedition trouble accelerating.Struggle to get to 30 mph Engine light with code p0174 system too lean bank 2. P0172 system too rich bank 1. What to fix?


ok............when you change plugs the cmptr needs to relearn firing order. it takes 3-5 times/restarts before it relearns. I went through the exact same thing with my expedition. a day or two later she purred like a kitten. secondly if you are having acceleration problems you may be looking at a bad catalytic converter. lastly......check your air filter, take it out and see how it runs without filter. that was also an issue I had when it was rough running. good luck

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2003 Chevy Blazer idles low and rough and accelerates rough until about 25 or 30 mph. Afterwards, it drives great, but the service engine light continues to flash.


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