The idle air control (IAC) valve is responsible for maintaining the idle air flow at the EEC's command. First, try to reset the idle programming (disconnect battery for 15 minutes, restart, let idle settle, add accessory loads within 70 seconds after starting - A/C, headlights, turn steering wheel side-to-side). If that doesn't correct the situation, you can clean or replace the IAC valve. it is the servo controlled valve on the passenger side of the throttle body with one electrical connection and held on by two, 5mm Allen head bolts.
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Scott
1991, 255K miles, glass hood, police grill, SVO shifter, Catz fogs,
K&N, 73mm MAF, Superchip, PP Y-pipe, Borla cat-back, 190 lph pump
Eibach/Tokico/poly, Alum front SFB, SS front/rear strut braces,
16x7.5" Moda R1, 225/55ZR16 Bridgestone RE730, -1 deg camber x 4,
6 disc CD, Class II hitch, Silver award at SHOklahoma Car Show
