Manifold Absolute Pressure (MAP) Sensor Performance
I would start with the obvious, make sure it is connected. Pull it out make sure it is clean and check the O ring for proper operational condition. beyond that I know there is someone here that can help.
2002 Chevy Silverado 2500HD
Extended Cab Long Bed, Indigo Blue
Keepin' it close to stock, daily driver for deep snow & huntin' n' killin'
Centrifugal Oil Filter, Air Dog II
Profab Performance Mouth Piece
New Head Gaskets w/ ARP Studs (not by choice)