Todd,
Adjusting the valves, while an admirable endeavor, won't fix your
non-firing cylinders. Swap the plugs with holes that are firing to
determine if you're getting spark out of the cap and have dud plugs. If
the plugs check out, and you know the leads are fine, then try another
cap. Little wee cracks in these beasties can really cause problems. When
you replaced the plug leads, did you replace the lead from the coil to
the cap? While a problem with the coil lead wouldn't give you problems
with only 2 cylinders, it was the cause of some mis-firing problems I
faced a while ago. Good Luck. Colin
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