Odd that you would say fuel pressure regulator. I had a GM Master tech email me to say that he had seen this issue and it was a leaking regulator under the intake plenum. It did start shortly after I replaced the fuel pump. Just can't see how a leaking pressure regulator would cause a 5 and 7 misfire consistently though. I'm going to pull the valve covers and look for unusual spring action and pull a compression test before I pull the intake. Thanks for your input.
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Today's Featured Article - Haying Before Tractors - by Owen Clark. Hi guys! At age 8 (1927, am now 79) I was learning how to drive a stacker team on the old homemade A-frame wooden stacker, on three of my uncles` dairy farms in Star Valley Wyoming (south of Jackson Hole, on the Wyoming-Idaho border). There was one steam tractor in the Valley, owned by an entrepeneur who used it to run his grain threshing machine, that he hauled from farm to farm for the fall harvest. We used teams of horses not only on the stacker, but on the buckrake to buck the dried
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