1988 Chevy Truck map sensor

Do you have a check engine light? Check the MAP sensor reference voltage and return see below

[quote:e90b48d9fe="rickm111"]Engine Performance problem
1988 Chevy Truck V8 Two Wheel Drive Manual
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I have an 88 2500 chevy 5.7 fuel injected . It won't run with the map sensor plugged in . I did vcgs plugs wires coil fuel lines and filter but it only runs if I unplug the map it doesn't run good but it runs . HELP PLEASE[/quote:e90b48d9fe] Tried New MAP SENSOR still won't run unless it's unplugged , engine light cwas on when I bought this thing .

Test the MAP sensor connector wires for short and open to and from the computer-