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magic930 magic930 is offline
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Join Date: Apr 2003
Location: Carnation, WA
Posts: 623
The popping is caused by unburnt fuel igniting in the headers/muffler. Fluctuation and popping can be caused by a cylinder that is not firing causing an uneven idle and power fluctuations at cruise. If you have a timing light hook it to each plug lead and make sure you have spark at every cylinder. If you don't have a timing light just pull each plug wire (one at a time) and hook up an old spark plug to it (and ground the body of the plug) and crank the engine over with the fuel pump relays pulled out. Should see a nice spark, if you don't then your distributer cap and rotor could be failing or plug wires need replacing.
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David
Old 07-23-2007, 08:21 PM
  Pelican Parts Technical Article Directory    Reply With Quote #8 (permalink)