Good Morning
My 1986 K100 RS runs really ragged at low rpm's or around town. Out on the open highway it seems to run OK unless you close the throttle, then the engine will completely shut down for 4-5 seconds then come back on with a few good backfires, I had a spare crank sensor, no difference, all battery cables clean and tight, fuel pressure off the delivery rail seems ok at 36 psi?? Any help will gratefully appreciated, thanks!