Idle To Low On My 1990 Deville

I GET A E49 WHEN MY CADDY IDOLS FOR A WHILE AFTER ITS WARM. SOMEONE SAID THAT ITS THE IDOL THAT TO LOW. I CANT FIND THE SCREW TO RAISE IT UP A LITTLE. WHERE IS IT AT........THANKS.

P.S. IAM NOT TO BRITE SO DETAILS PLEASE.:screwy:

P.S.S. IF YOU CAN THINK OF ANYTHING ELSE I SHOULD TRY PLEASE DONT BE AFRAID TO TELL ME.

The idle is computer controlled. The code is probably for the Idle Speed Controller (ISC) motor. They tend to go bad when they get old. I just replaced the one on my '93 Coupe because it was idling too high.