No vacuum to the tranny.

 

So you saying the Idle problem is only in third gear?

 

Negative. Anytime the motor is reved it holds the high rpm. For instance. I pull it outta gear doin 50 and the motor revs as though my foot is still on the acc. Every now and then it hiccups 2or3 times. Is there a sure fire way to check for vac leaks? Or any sensors that i could change?

 

I use a length of heater hose as a stethescope to listen for vacuum leaks.

 

Back to the IAC. Does the idle drop out when you disconnect the IAC. (as it should)

 

agreed. check the IAC already.

 

Will check the iac this evening. Ty for all the help.

 

pulled off iac harness.... runs like a champ didnt try to stall or anything, just runs great. drove around with the iac disconnected and turned lights ac and anything else on that would move and truck didnt miss a beat. my mech can kiss my ***. to all those that helped and offered opinions THANK YOU VERY VERY MUCH!!! been fighting this for about 6mo now. first part i replaced was the iac. s.o.b. im ecstatic. once again ty all. p.s. what could be the cause for my motor not needing the iac attached ???