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I have had some transmission problem for a while. One mech had changed trans oil but not much help. won't go to 4th gear. But has been running fine until today. Car was parked for 2 hours. Started fine as usual. Suddenly the engine went out. Started and drove a bit to stop sign, went out again. Drove next two miles without a problem. This is the first time I had this problem ever. Car has 90k miles. Last tune up at 57k. what is going on. Any advice will be appreciated.