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I purchased a 1988 Winn Chieftain 22 with a 454 carb engine. I replaced the plugs, wires, cap, coil and she runs great to about 40 mph. At 40-45 the motor looses power, sputters and back fires until I take my foot off the gas and then it will run up to 40 and do the same thing. The gas is new. I could not find the fuel filter so it has not been replaced. The motor only has 58k on it. I am looking for any help. Also has anyone worked on the wiper assembly?
Thanks
Check on the inside of the right (passenger) side frame rail for an inline filter. If its a Quadrajet carb there should also be a filter behind the one inch fuel inlet fitting.
I have the same problem but i fixed it by my self first change the fuel filter and then cheked your alternator if they charging i replaced the alternator and the back firing is gone you know why i dont have the right voltage
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