Unpluged the MAP sensor...

[caprice]

I tried running the car in differnt limp modes by running it one sensor unplugged at a time. Unplugging the MAP brought the GPH (on scangauge) from .5 to .1-.2, yet It says 14.2 PSI at engine off. weather.com says the barometer presure is 29.92 which is the same as 14.7 PSI. Electrical parts are NOT returnable! So I want to be sure before i sink $65 on a new MAP sensor... that this is the part I need to finnally fix it. I don't want to be throwing parts at it.