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Were would I locate the map senor

(1990 Chevrolet 1500 Pickup)
in Dallas, TX on October 19, 2011
sort of a surge up and down idling
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MAP sensor should be on the intake manifold, according to the wiring diagram it has three wires at the sensor, light green, gray, and a purple wire.
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MAP sensor should be on the intake manifold, according to the wiring diagram it has three wires at the sensor, light green, gray, and a purple wire.
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