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Message: <blockquote data-quote="ekvh" data-source="post: 153864" data-attributes="member: 1179"><p>Back to my latest nightmare. Everything affects everything, right? How about a randomly firing spark plug? I am back to almost all stock settings now and was trying to smooth out the idle and sync. I kept getting a lumpy idle. Couldn't figure out why, but flat fours are known to be lumpy at idle. Finally turned one screw nearly all the way in, got a smooth idle but three cylinders. I had shut it right down. The light in my head slowly got dim. It was dark. So when I turned the screw out I picked that cylinder back up, but lumpy again. Pulled the plug wire, same smooth idle. Amazing how nice these will idle on three cylinders!! First I closed the plug ago some to see if it was too wide, nope. So I dropped an old plug in and voila, she ran smooth again. Put a new one in this morning and it runs great again. I still have a 130 main jet and I still have some backfiring on deceleration, but I think I'm going to leave it and drive it like this for a while. Two weeks of messing around with jets and air filter and probably all because of one bad NGK. I doubt I have 5000 miles on it. No visible cracks. Weird.</p></blockquote><p></p>