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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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