1998 navigator runs hard when gas given
what do you mean "runs hard"?....like the timing is advanced too far forward and is "KNOCKIN" because this would be caused by a lean condition and too far in advance timing~....check all vacuum lines and replace them with silicone ones...make sure sensors like the IAT sensor and block temperature sensors are within range and get a NEW air filter, PCV valve and cabin filter while you're at it~
Detonation is Destructive....please do not make the engine detonate~
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