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comanche running problems

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well my truck is running horrible it almost like it is back firing and bogs when it has a load on it I just checked the TPS sensor seems to be right its at 4.86 closed throttle and 4.85 fully open says in my book that that's right. when i unplugged the o2 sensor it won't start at all. it has a new fuel filter that i installed awhile ago air filter is fine plugs are all good. tomorrow I'm going to check fuel pressure. any ideas what it might be. I'm going to check the catalytic converter too.

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