now that i got my overheating problem sorted out on to the next. at idle the truck doesn't stay at a constant rpm, now i have a stepper motor code but changed it but it won't go away. in drive at idle it idles pretty nice most the time maybe dropping once in a while. any imput would be great.

 

Lets start from scratch, what have you done to try and correct this problem so far?

 

well, new plugs, wires cap rotor, stepper(from advance the one that cross referenced the ac delco number) i checked the trottle potentiometer with an ohm test , head gaskets and up, vac hoses seem fine. the only thing i can think of is if the o2s are sending a bad signal making the stepper act weird causing the light and the surging.is that possible?

 

As Spike will tell you, you will need to go have your new IAC set up to your ECU so the idle will be where it belongs.

 

i thought that wasn't the issue with d1s, if it is what is the procedure, or what tools do i need, I'm going to a lr rally this weekend with a big group of rover guys together someone may have what i need.

 

You wil need a scanner with the proper software to reset your IAC, you'll need to call around and find a mechanic who can do it for you.

 

The IAC on a DII is not old enough to fail yet, but on a DI they are and you need to have your ECU reset by the dealer.
It is a 50/50 shot if the new one will need to be reset or not, yours needs to be reset.

 

if its a 50/50 chance than i'm not buying any lotto tickets anytime soon cause my luck is nonexistent. what type of system do they need so i don't sound like a moron asking if they have the computer thingy to reset the iacv?

 

T4 or TestBook.