Am having trouble with the LPG system on a 1994 ED. Car runs fine as it should on petrol. On LPG it starts and idles perfectly. The problem is that when cruising say 60 Ks and I lift my foot off the accelerator the engine dies. The rev counter drops immediately to zero. If I slowly reduce speed the engine reduces revs normally. The idle speed is about 600 rpm. The same thing happens if I rev the engine (say to 2000rpm) in park and lift my foot. If I slowly let the accelerator off then engine acts normally. Does anyone have any ideas as to what the problem may be.

may possibley be the diaphram in the mixer..

Sure was. Thanks for advice

was it an impco mixer?