My car runs fine until it warms up, then it shuts off. Before this problem started I would be driving down the road and the rpm tach would occasionally drop for a second and go back. When the problem started occuring and presently, the rpm tach would drop and the speedo would decelerate, but the car was still on for a few seconds until it died off. I replaced the cap, rotor and coil because they looked worn and the problem wasn't fixed. Any suggestions for what to check are greatly appreciated. Also I dropped the new coil today before I installed it. You don't think it got messed up somehow do you?