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Discussion Starter #1
I have bad idle on my truck. It comes and goes and sometimes I can't get it much past 40mph but other days it runs like a champ???? I have replaced the idle air, mass air, pcv, air filter, fuel filter, new plugs and wires. Oil pump maybe?
 

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Check for vac leaks , though dont know why it is not consistent and comes and goes .You checked cyl compressions ?
 
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