the map sensor is on the intake manifold on the pass side.... its facing up and is black in color should have 3 wire going to it.... check the wiring all the way back to the ecu to make sure u have no shorts..... if not... probe the map sensor (not the black/brown wire) i believe its the yellowish one anyway probe that with a volt meter and give the voltage readings to us like this
(just an example not actual readings *it should not look like this*)
map voltage rpm throtle %
5v 4500 wide open
3.5 2500 1/2

and so on
id do idle,1/4, 1/2, 3/4 , and wide open

just to give an idea
now one wire u should be getting 5v constantly that is the computer's referance wire...the other would very....and the black/brown wire should be grounded ie 0v.
hope this helps a lil and be sure to post this too
also if u can do the tps for me
tps=throttle position sensor (located on the throttle body back, top sensor. wired the same way..

jake

M50 I6 DOHC,dinan CAI , Remus Cat back , Volt. regulator, AA stg II software, Centerforce stg 2 clutch w/ alum dual mass flywheel,Stang 27lb inj.,Rouge chasis kit, Mayle balljoints, M3 X brace, 3.35 diff.Bavauto springs w/ tokito struts/shocks.

1997 GS- RIP
engine: AEM cai , pp head / TB / intake runners, Chikira 4-2-1 header , custom 2.5" exhast / pacesetter high flow cat/flowmaster2 muff,1mm over sized SS valves,PT valvetrain, AEM cam gears/pully set, prothane motormounts,440 injectors , ground kit.
Trans: Custom ATX (1 of a kind) poly-graphite steels , kevlar clutches , final drive , shift kit,3500 stall TC, Tourqe Wonder trans chip ($120.00 2gnt price only!!email for order info)