1989 Oldsmobile Ciera eng missfire

1989 OLDSMOBILE CIERA
145,000 MILES • 2.8L • V6 • FWD • AUTOMATIC
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KJR2322
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sporadic miss replaced plugs wires f pump f filter all injectors coil packs (3) ing module ecm o2 sensor no codes stored c converter good eng vacuum 15" plugs no deposits comp 145 straight across what am I missing?
Nov 14, 2014 at 10:44 PM
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HMAC300
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your vacuum shold be around 20" at idle check for a vacuum leak or plartially plugged converter/exhaust
Nov 15, 2014 at 6:39 AM