I hope you guys can help me figure out what's up with my '89 300TE. The car is in excellent condition with 195k. Transmission shifts a little crisply on first shift [(1-2?) or (2-3?)] second shift is smooth, no third shift. Just drove 100 miles at 70 mph and blew a half tank of gas. Throttle response was excellent though! Please give me your thoughts as to where to begin isolating the cause of this shiftless experience.

Thank you in advance for your assistance.