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I have an '86 ProV 150 that runs well but I'm wondering why the motor will suddenly drop about 500 RPM. It will be running along at 3000 RPM and will continuosly drop to 2500 and return to 3000. Any help would be appreciated.
sounds like youre dropping a cylinder.
when is the last time you changed plugs and cleaned carbs?
do those then run on an auxillary tank, ball, hose to isolate motor issue from tank issue.
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