starts up fine,drives. intermittently car will "jump" or"shudder" while driving. clutch in at light, car idles down like normal, then motor may just die like i turned key off. no cel, all other lights on dash turn on like im gonna start it. to restart, may take 6-8 tries. this morning, started it to warm up and 2 minutes later it died. did it three more times just sitting there. i pulled main relay and resoldered all joints. did not help.