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On my 91 explorer the idle speeds goes up and down when it is idleing, about 200 to 400rpm consistantly any ides on what may cause this? Just did complete tune up and air and fuel filter.:icon_confused:

On my 1991 ford explorer 4.0 when it rains it misses when i start it up and and continues until engine is warm and still does it once in a while. When it is dry out it don't miss a beat. Any suggestions?

What do you recomend for exhaust size on my 84 bronco II? It has no cat and noise isn't a issue.

I done a duraspark conversion to my 84 bronco II and it will not fire until i let off of the key. It will crank all day long and not start till the key switch goes back to the run position. Any suggestions?