Hi, Lode51, one thing to check is the play in the distributor bushings. To check, set the point rubbing block on the highest part of the cam and then push with finger the cam away from the block and check clearance, then pull the cam towards block and recheck clearance and that will tell you how worn the bushings are. Maybe Hotrod will step in and say what is a usable difference is. I found this out with a 1950 ARIEL SQU. 4. When I would come to a stop it would idle between 0 and 2000 rpm. It had a point gap of .016" but I could change it by .022 with the above method. I had new bushings installed and then had normal idle speed.
