Question about 1990 GMC Sierra
1990 GMC Sierra 1500 (5spd) lifters knocking. Engine lopes, when excelerated. Rpl PVC valve, changed oil, rpl spark plugs,new exhaust line. Oil pressure gauge low.Purchased with quite a bit of oil sludge. I've changed the oil several times since purchase at 115k, now at130k.Could this be a bad or clogged oil pump? Suggestions?
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Posted on Jan 02, 2017
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