I have a TH460B that has an intermittent issue with running rough. It will start to stutter and blow black, grey, and blue smoke intermittently at mid RPM and up. Then if you ldle it down it runs fine (at idle), then as you increase RPM (with or without a load agains it) it startsto run rough again. Sometimes the accelerator pedal is unresponsive also. It has a new accel pos sensor and priming pump/ filter. It has good fuel PSI and flow at the priming pump, good voltage, no bare/ rub spots on the harness, fluid levels are all good, no active faults displayed. Im stumped!!
United States / Canada
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