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85 ranger runs choppy

(1990 Ford Ranger)
in Condon, MT on August 14, 2010
85 Ranger motor runs choppy cant gain speed especially up hill new plugs new plug wires replaced fuel filter now truck won't start
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on August 15, 2010
this could be a couple things, the fuel pump is going bad, that could be why it isnt starting. or the catalytic converter is going bad, that could be why it is running choppy and not accelerating very well, and it can cause the vehicle to not start.
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on September 28, 2010
cat is stopped up in the exhauset or its out of timeing
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