Check spark plug wires condition. If you don't have an ohm meter. In
the dark with the engine running spray a mister bottle of water over
the wires & watch for the light show. No light show & no changes in
engine running, wires are "ok" enough to proceed to other checks.
Clean gas? Clean fuel/Air filters? All connections clean and tight?
Check under distributer cap for signs of arcing (when we were being
jokers in school we'd draw pencil lines on friends distributor caps)
Hours of fun ;-)
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