[AdrianH]

After about eight years of progressive work (over when I got the car) my MB is now running - in general - very sweetly. There's just one last nagging glitch. When the engine is cold throttle response is smooth throughout the rev range and under all load conditions. However, once it's warm there is what I can only describe as a sharp hesitation when I come back on the throttle at about 1500rpm under load. This doesn't happen while the engine is warming up. Normally I can drive around this but in town it's a bit of a PITA and it doesn't feel good for the car –*it would be nice to get it sorted. BTW the car has a new ISV and the picture is all set up correctly according to Phil Payne's instructions. Th only slight question mark in that is that I'm not sure when the gas analyser I used was last calibrated.

Anyone any ideas?