Then when i stop its slow on take off when i get about 30 mph i runs and shifts fine..befor light comes it runs fine to
Go buy the repair manual for vehicle (about 20 bucks) AND a code reader.(between 50 and 300 bucks. Both specific to your vehicle AND vehicle year. Million reasons for check engine light - but that light is basically saying, "I'm seeing something wrong, so check my vehicle computer for what I'm seeing" and the fact that it goes away or may go away just says the problem may be intermittent or keeps being cleared for some reason, either the problem fixes itself or the computer clears code for some reason, probably the former.
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