OK, changed to richer metering rods, then different rod springs, then fuel filter, one at a time, no change, the only thing left on my trouble shooting chart for mid throttle pinging, is dirt in low speed circuit (which I have no idea how to get to), and an air leak. I did replace all my vacuum lines inside the cab, they were old and brittle, and hooked canister back up, that is where I will start first, by unhooking can, then maybe the plastic brake booster elbow, pcv? Can any of the vacuum pods or vacuum canister or heater air valve have enough problems to cause a lean condition but be unnoticable at idle?
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