continuity of the wire, dirty sensor

Look at the highest point of throttle body. There is an adjust screw. (It might be covered with a cap.)

remove the cap and turn the idle adjust screw clockwize. count your turning degrees because you might want to put it back where it was.

and you should first ground the idle/timing checker and have a warm engine

then when you get it to 700?- check the timing

Don't mess with the idle screw. Find the problem that's causing the idle to go out of adjustment..... which is not the idle screw.

Frank

When my engine is cold it immediatly revs to approx 2000rpms on startup it then gradualy reduces to approx 1000 when hot. I'm pretty sure it didn't do this before I replaced the iac. The new iac acts completely normal and lowers the rpm in steps but doesnt't bring it completely down. I have been getting a code for bad intake air temp but it tests ok. Any thoughts???

I'm pretty sure it didn't do this before I replaced the iac.
Gordon

Don't mess with the idle screw. Find the problem that's causing the idle to go out of adjustment..... which is not the idle screw.

Frank

BASIC IDLE SPEED ADJUSTMENT ~14Fi-w
Caution
There should usually be no need to adjust the basic idle
speed because it has been precisely adjusted by the
manufacturer.
Preconditions for inspection
l Engine coolant temperature: 85-95?C (185-205?F)
l Lights and accessories: OFF
l Transmission: neutral (N or P for vehicles with automatic
transmission)
l Steering wheel: neutral position
(1) Connect a tachometer if the multi-use tester is not used.
(2) Disconnect the female connector for waterproof from the
connector for ignition timing adjustment.
(3) Using a lead wire with alligator clips, ground the terminal
for adjustment of the ignition timing.(4) Using a lead wire with alligator clips, ground the No. 10
terminal of the self-diagnosis connector or connect the
multi-use tester to the self-diagnosis connector.
NOTE
By connecting the multi-use tester, ground the No.10
terminal of the self-diagnosis connector.
(5) Start the engine and run at idle.
(6) Check to be sure that the engine idlig speed is the basic
idle speed.
Basic idle speed: 700~?50 rpm
If there is a deviation of the engine speed from the basic
idle speed, first determine whether or not the conditions
described below exist,and then use the speed adjustment
screw to adjust to the basic idle speed.
(a) The engine speed may be 20-100 rpm low for a new
vehicle jdriven about 500 km (300 miles) or less], but
adjustment is not necessary.
(b) If engine stalling occurs or the engine speed is low
even though the vehicle has been driven about 500
km (300 miles) or more, it is probable that these are
deposits adhered to the throttle valve, SO it should
be cleaned. (Refer to P.14-65.)
(c) If the engine speed is higher than the standard value
even though the speed adjusting screw is fully
close, check for any indication that the (fixed SAS
position has changed; if there is such an indication,
adjust the fixed SAS).
If there is no evidence of a change of position, it is
probable that there is leakage resulting from deterioration
of the fast-idle air valve so replace the
throttle body.
NOTE
If the multi-use tester is used, select item No.22 and read
out the engine rpm.
(7) Turn OFF the ignition switch and stop the engine.
(8) Disconnect the lead wire for grounding from the connector
for self diagnosis. ~
Or disconnect the multi-use tester.
(9) Disconnect the lead wire for grounding from the connectfor
the ignition timing, and then connector the waterproofing
connector.
(1O)Disconnect the tachometer.
(11)Start the engine and let it idle for about five minutes; Æ
check to be sure that the idling condition is normal.