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Re: 1988 Grand Prix 2.8L Tip In Stumble....got me stumped.
Posted to Technical Discussion Forum on 9/23/2005 1 Reply

Hi Aaron,

I agree with Scott. It sounds like something is pulling your 5v power supply down to ground. The MAP TPS and Coolant level sensor all share the same 5v supply from the PCM. The last one I did like this was the Coolant level sensor at fault. Unplugg... Login to read more.

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