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Re: 1991 chevy 1500 5.7 tbi erratic idle
78 had hydraulic lifters. my 66 had hydraulic lifters. you can adjust the valves. distributor drive gear should be the same. get the 91 tbi distributor,
unless your gonna switch to carb then get a HEI with vacuum advance.
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 O2 GMC RCSB 4.8L V8 AUTO 3.73's
rebuilt/beefed up 4L60E(at 43,000miles)
 Matching Ninja 500r
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