Just had my 800 TQ restored. Runs great around the neighborhood but got back from a 40 mile trip in 85 degree temps. Shifted in 1st & 2nd, no problem but the hotter it got had all kinds of stuttering and bogging and drowneding. Couldn't get any faster than 40-42 mph. I stopped for 10 minutes, it got better for the next mile, barrely got up the hills. Engine temp was fine on the gauge, engine compartment is very hot. Was the gas boiling? Thanks