David, Thanks for the tips. I'm wondering if it could be worth while to permanently install a small fuel pressure gauge at the CPR. (Such a thing could diagnose several problems such as bad CPR or a hot start/no start problem.) Since I experience the problem only intermittently now, I could use up a dozen or more copper seals installing/uninstalling my large fuel pressure gauge from NAPA before the symptoms might recur. I hate to put unnecessary wear & tear on the fuel line connections. Also, sounds like a bad idea to leave the NAPA gauge connected since the long hoses could get in the way of something. If the problem is in the control pressure regulator, then how can it be in the wiring? As I understand it, the wire is there only to heat up a bi-metal strip inside the regulator. I assume it would take at least a few minutes for the electrics to have any effect on fuel pressure. And by then the engine would be warm enough that the symptoms would go away. I never thought about checking the vent hose. Wasps around here love to lay eggs in holes like that and pack them with mud. Walt Tampa, FL ----- Original Message ----- From: <jtrealty@xxxx> <snip> > Look at the control pressure regulater as it is critical to idle > quality during warm-up. Check the wiring connections and the vent hose > is not blocked or kinked. <snip>