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94 Posts
I just replaced the vp44 and the truck ran good. Then 4 days after chaange the truck sorta missed when i got on the petal to merge into traffic. I went from 18 mpg to 13 mpg. I went to advanced auto ran codes and they were p1688 p1689 we reset the codes and they came back. I took it to the shop that put the pump on and they say its not throwing those codes any more. I told them to drive it and then check to see if it will come back. These guys are honest and do a good job. It just pussels me as to what it could be. Do you guys have any suggestions?
