hello olds fans..have a little problem i hope you can help me out with.have a1987 olds cuttless ceria 3.8 when i start it in the morning{cold start}it idles high when i turn off the car and restart it it goes back down to norml idle..how do icheck if the iac switch is bad...it only happens when motor is cold...thanks for all your help bob

Its normal for the engine to idle higher when its cold because its in an open loop. When the engine hits a certain temp, and the 02 sensor is sending certain range of voltage and a certain amount of time has past since uve started the engine it will go in closed loop. Do you have a tach? Wats the cold idle? Signs of a bad IAC would probably be surging, stalling or almost wanting to stall than revving up on its own.

i for got to tell you all. that the check engine light comes on . when i drive off it goes out. is this normal

Thats not normal, get the code its showing. get a wire and put it in the last 2 ports on the top row of ur port under the dash/steering wheel. put the car to the on position and it will flash the codes 1 blinks, 2 blinks means code 12, it'll do that 3 times and it will flash the trouble code (eg 3 blinks 4 blink code 34) then again it will flash code 12 and either 34 again or if u have more codes it'll show that.