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Rough Idle Question


drl911

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Posted

1993, GMC K1500 XC, 5.7 liter

 

Very rough idle, wants to stall in gear w/ foot on brake, driveable, but not smooth.

 

Cannot find any air vacuum leaks.

 

Replaced IAC unit, no improvement :)

Replaced MAP unit, no improvement :sigh:

 

I discovered if I leave the vacuum line disconnected from the MAP unit, idle is normal, but the service engine light comes on.

 

What should I do or try next???

 

Thanks,

Dan

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