2003 Mazda 323 Automatic 62584 miles
hi I had a problem with the car bucking while I am on the highway. Around 80-90 on the speedometer, it had put a gas treatment and a injector treatment, it stopped for a while and it recently came back. Another problem also is that when I am in slow moving traffic it cuts off and will restart after. It also happen when I am waiting on a traffic light. Can you shed some light as what to do about the problem. Thank you.