I had codes 34-53-34-75-5 I had a spare ECU and changed it ,took test drive about 20 miles everything was fine the next day same codes but when I pulled it into the garage the check engine light went out and it started to run better???? I know it is an intermittent problem and I know I should not get code 75 or just a 5 any suggestions on what is loose or broken ????
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