I have Datsun 200B L20B motor all parts replaced and the carby rebuilt the problem I have is when I start the motor and it warms up when I put it in auto-drive about 5 sec after the motor start to shake and it going to stop running so I take it out of auto-drive and the motor idle ok. parts that I replace is the Spark plug, leads, Distributor cap, Ignition coil, points, air filter, and the carby rebuilt, all hose has been replaced.This l20B motor is a 4 Cyindermotor