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Old 05-22-2013, 11:57 AM   #3
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Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 51
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Vehicle: 94 LB 2x4 Manual VG33e
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Caddy, I don't know the 87 Service Manual nearly as well as the 94 version. On mine, though, I have a sensor that detects when the A/C turns on (or when the Power Steering is being used) that triggers the idle to go higher.

You could have a bad signal (dead sensor, broken wire, corroded connection, etc) from the A/C.

Since I do not have A/C, you'll have to look around on your A/C unit for some sort of sensor that is not plugged in.
Joe (not a mechanic!) Don't have an account? EMAIL ME
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1994 VG30E to VG33E with H256 Cams

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