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CQ Lurching?



Not knowing even where to start, I, of course, start at the top!

My 1990 Coupe Quattro is exhibiting a strange lurching during the
transition from accelerating or steady state speed to decelerating, but
only below about 2000 rpm, most noticeable in first gear. Idle is rock
steady, at about 900 rpm, warm or cold. It is impossible to not have it
lurch at low rpm, even trying to go from steady to decelerating in no
traffic, like a parking lot. Do my best Astaire tap dance, it still
lurches. Higher engine speed it is fine, smooth as can be. Any ideas?
What should I look for? Ignition? Fuel delivery? Magic?

Ian Duff, New Bedford, MA, USA
1990 Coupe Quattro