sputter at low speed low rpm
In first or second gear at low rpm, or when backing off the throttle I experience what feels like and sounds like engine misfire. There is no loss of power or stalling. Can't tell if it happens at higher speeds/rpm, too noisy.
My mechanic replaced the spark plugs and caps and vacuum tested the carbs. tells me the carbs are balanced and voltages are good.
After I got it back, it still does it, but not as much.
What else could cause the misfire experience (if that's what it is)?
I run high test only and each refill gets Sentry gas treatment.
@ 23813 miles