E30 Zone

My 325 devoloped best described as kangrooing but on de-acceration. I put it down to idle mixture been out which i got the local mot station to correct. But now thats sorted its still there. Come off a motorway and start slowing down and its horrible. Car goes and idles ok so lost now. Any ideas?

The usual! Air leaks/TPS/injectors. Unfortunately, you've now added a complication by letting someone, who should know better, play with a preset adjustment. The idle mixture was set at the factory and NEVER needs adjusting.