Went on a 200 mile round trip tour today. Car was doing great, cept for the way back. It would miss really bad and tach would drop to zero for a split second and continue on like nothing happend. Did this once every 10 minutes of driving, finally got back home and died. Car starts right back up. Could this be a problem with the CPS? As ussually anytime the tach drops like that, the problem lies with that. Any input would help.