I had a similar prob except my car would also stall occasionally. also seemed more frequent on damp days. anyway, I replaced the fuel relay plugs rpm sensor and cleaned the throttle body and all the ground and power connections.....with no luck. Finally I checked the coil wire at the distributor cap and viola' the wire ends were totally corroded. apparently when it was cold and damp it only made an intermittant connection but better once it had warmed up. hope this helps