285 kpa without starting tne car

[SIXBANGR]

Ran fine two weeks ago. I go to fire it up today and it runs real bad. Turned the laptop on and I have 285 kpa and 27lbs of boost without fireing it up. I changed map sensors but I get the same thing. '87 GN. thanks.The blue dot just goes left & right on the 285 line

 

[norbs]

Check for a pinched wire or short at the map sensor? loose connection on ecm connectors????????????

 

[SIXBANGR]

Must have been a bad connection. Checked for 5v and ground. Pluged it back in and it is fine. thanks