My 1990 quad started quitting at idle a few months back. Had mechanic check all grounds , replaced may relays ( which needed replacing anyway ) . Car ran well for a while then the problem started again...came and went many times ,which can drive you nuts. Then, I read somewhere that the amount of fuel in the tank can make a difference. This morning took a car for a drive and the problem of quitting at idle became acute, so I went and filled up the thank and the problem vanished . That could explain the intermittancy since I did not correlate the amount of gas in the tank with the idle quitting problem. What do you alfisti think?