So i got a 68 ohm resistor and plugged it into the iat plug, cold engine, I let it run 4 min. And nothing but the check engine light came on immediately. Is that normal for the light to come on. Did I do it right and my high idle is not enabled?

The check engine light should not come on. I don't remember what the exact resistor that should be used is but for some reason the 68ohm doesn't sound right. You might double check that.

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/26-engine-systems/436-high-idle-detecting-if-the-ecm-has-been-enabled-for-high-idle

Read here. You need a 39,000 - 100,000 ohm resistor

Yeah, the article calls for "K" ohm resisters. So a 68,000 would work, not 68.

Also, are you sure you put it in the IAT plug, or the MAP plug?

Basically 56㏀ (or 56,000Ω) which should be (Green, Blue, Orange, Gold) and it will test for 3 cylinder high idle. Typically found at a Radio Shack for a couple of bucks.

MAP sensor is on left of pic

AIT sensor is on right of pic

I knew I needed over 56 so i got a 68 but I didn't pay attention to the K part. I don't claim to be the smartest. I'll go back to radeo shack tomorrow aND get a 56K. I did get my BHAF today and installed it.