Thread: GMC 250 Inline 6 Tuneup
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Old 05-24-2021, 09:48 AM   #5
68gmcdude
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Join Date: Jun 2017
Location: Mentor, OH
Posts: 126
Re: GMC 250 Inline 6 Tuneup
It runs very rough. My guess is the timing is off but I want to check everything
Last edited by 68gmcdude; 05-24-2021 at 09:58 AM.
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