Serious hesitation is usually an indication of lean running. Yes, the temp sensor could have an effect, but what cured the TE from the "I have it almost floored and it's only just above idle for a second or so" was fixing all the vac leaks. Mixture was then running at 78% duty cycle, everything is fine now that I've got it set correctly.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!