What happened to the mg3 fault light?

On June 30th, 2008, mg3 was insured. Last year, from time to time in June+February, 5438, shortly after the start of the cold car state, (note: only in the cold car state, there is no such phenomenon after the water temperature of the hot car rises) the engine jitter was accompanied by the flashing of the fault light. Sometimes it disappears and returns to normal after a few flashes, and sometimes it has to be turned off and restarted. Sometimes it is weak to shake and refuel (indicating lack of cylinder), and sometimes it is safe to refuel. The first question is cylinder pipeline and carbon deposit. This soft fault is best eliminated. The following is my investigation process: I cleaned the throttle and idle motor for the first time in 4S (I didn't wash it before, so I saved it) and received 128 yuan, which was unsuccessful. Drop in every other day. Clean the spark plug and replace the cylinder line during the road test. Actually, my original one is good. It's free. It's a little better this time. It lasted for half a month.