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92 745 Turbo questions 700

I have a 92 745 Turbo that I put a used engine in a while back. It has been running great except recently. It has an intermitant problem with idleing. It does what they call "hunting" meaning the computer is hunting for the proper idle speed. I'm thinking it could be one of the many sensors going bad or it could also be one of the hoses from the Turbo to the intake manifold? These hose were soaked with oil from the original engine having excessive crankcase pressure. The engine runs fine above an idle and gets pretty good gas mileage. Any ideas???

Thanks,
--
Volvos4me4ever 1989 245 276K miles still going strong, 1992 745 Turbo 114K miles real nice!






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