My dad's suburban has been going downhill for awhile now, he's been replacing a whole slew of parts and it's been in and out of the shop almost every other week now. It has the 8.1 and 220,000 miles on it...well he mentioned that he thought it was only firing on 7 cylinders and today when I rode in it I could definitely tell. We think that one of the injectors might be fouled as well as maybe a bent pushrod/lifter like last time. Any ideas?
Originally Posted by stx4wheeler
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