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Q: (know nothing,no money to fix) Need step by step help to replace MAP Sensor on 2003 GMC Envoy

It is running rough, set off warning light code replace MAP Sensor. It says I should try cleaning and replace before replacing the new sensor. I know nothing but neccesity drives the need to learn Help?
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just take the screws off the MAP that is connected to the hose, spray some chlorinated brake cleaner on the wiring to clean...and reinstall...
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the code doesn't say repl sensor,it says there is an issue with that circuit. seek diag and est b4 wasting money throwing parts at it
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