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Thanks Sep, I will definitely check that again. I'm assuming that a check from the pressure port is sufficient? Here's mechanic's report off of the original pump: TEST DRIVE AT WOT TO FIND LACK OF POWER. O2 SENSORS GO FULL LEAN AND WILL NOT SHIFT. CHECKED FUEL FILTER TO FIND CLEAN AND NEW...

I've got a 99 Tahoe, 112k, 5.7l 4wd suffering a very tough to diagnose (for me) loss of power for the last month or so. Forgive the long explanation, but I'm hoping someone else out there may have had a similar situation.. The issue started on long slight inclines as a shudder during climb...