I turned the allen head adjustment screw for the metering rods one full turn clockwise (rich). Test drove it from stone cold to full operating temp and it didn't stumble once. Let it completely cool down and drove it again and it stumbled from fast idle off until the thermostat opened. Same thing happened after I re-checked the carb linkages. Ran great on the first run and stumbled on every run after.
Maybe I just need to slam the hood before each drive. :BangHead:
