IAC

I was wondering where the IAC is located on my 1999 GMC 5.3. I was also wondering if a problem with it would cause my trucks idle to drop to below 500 rpms when i put it into gear then before dying shoot back up to the normal 500 rpms. If its any help the truck idles fine if not a little high when you first start it up in the morning then after idling for a while it levels out. I was also wondering if I would need a new IAC if thats the problem or what to do to fix the problem. I have already cleaned the throttle body with cleaner.

what mods does it have. the iac is on the throttle body. it is right above the throttle position sensor.

it has a tb spacer and airaid intake. I also have single in dual out exhaust. I am looking into a tune also and would like help as to which is the best?

A NELSON TUNE IS THE BEST!!!!!!!!!& #33;!!! and anybody that tells you different is full o shit. i have had westers shit and it would not go to where i wanted it to. predator is a paperweight.the best way i can explain it is this:

IF YOU JUST WANT TO GO A FAST GO TO SOMEONE ELSE.

IF YOU WANT TO WIN WITH THE BEST--GO NELSON.

and this is his sight. :smile: :rock:

I have been reading all the opinions on the nelson tune and I want one so bad i can't stand it. As soon as I get the money I am going to get one. I live in kentucky thought and is it any problem for me living far away and getting the nelson tune. There also is free updates right. Like if i add a cam or get bigger tires after i get the tune it can be upgraded for it? Any more info on the tune would be great the way the people on here talk about them makes me want one really bad.

yes there is free updates. I live in ohio, so i got the mail ordered pcm and i cant complain. i went from a 15.44 to a 14.95 with a tune. Its the best thing i have done to my truck.