Runs great (22mpg on highway) in all situations except one. After motor warms up,
there is a significant stumble on take-off from a stop.
Does not happen when cold. I can make it smooth by feathering the clutch or revving up the motor. But with normal, wife-in-passenger-seat takeoff, it stumbles. Truck kinda lurches like I'm just learning to drive a clutch. Annoying.
Motor is bone stock. New plugs, air-cleaner, PCV, distributer recently disassembled to clean and lube the advance breaker plate. HAI is not working but that should only affect cold running, not hot.
Any ideas ?