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My truck had a difficult time passing the idle speed emissions test because I had one bad spark plug that was causing the cylinder to miss about once every three or four revolutions of the engine. I figured out which spark plug was bad by hooking up my timing light to each spark plug wire one at a time until I found the one that wasn't making the timing light fire at a nice constant rhythm. Once I replaced the spark plugs, my truck passed the emissions test. Of course it didn't help much that several lobes on my cam shaft were severely worn.
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