Changhe Freda can't afford to add speed jitter. The electronic oil pump ignition coil, throttle valve and cylinder line spark plug have all been changed, which can't solve the problem.

Since so many things have been changed, it has not been solved. Check the throttle position sensor and idle motor, and check whether the engine timing and ternary are blocked. There is also the oil pressure regulating valve and vacuum tube on the oil rail to see if there is any problem. If the iron wire of the engine is loose, just check it as I say, and you will definitely find it. If there is something wrong with the car, ask the car master. 4s shop professional technician, 10 minutes to solve.