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International Automotive Technicians Network
Re: 02 Chevy Express, P0401
Posted to Technical Discussion Forum on 2/17/2006

Well, I'm going to put a fork in this one. When I did the functional test I noticed no change in MAP while I was commanding it, up to about 40-50%. After that, there was quite a change in MAP and the engine stumbled pretty good. The Actual vs Desired position ... Login to read more.

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