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1990 f250 351w missing

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Old Sep 10, 2014 | 09:15 PM
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Jd9112
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1990 f250 351w missing

Hello everybody, i have a 1990 f250 with a 351w engine that has a constant miss at any rpm wether it is under a load or not. Odomotor reads 27,xxx i assume it to be atleast 227,xxx miles. After replacing all the sparkplugs i found that #8 cylinder had a plug gap of about .003, i assumed this to be the problem but i have put all new plugs in gaped at .045" along with a new cap and rotor, plug wires, and air filter, i also cleaned the throttle plates and barrels with a toothbrush and gum cutter. Engine persists to miss so i sprayed all vacuum lines and gasket areas and all are fine.also the gas tank seems to build pressure for some reason, i have not looked into it yet dont know of this could contribute to the issue though. Any advice or input is much appreciated. Thank you!
 
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