I read in your post that the TB was replaced. After it was replaced is that when the idol was about 900rpm, if all of the gasket was not removed that could be a source of a vacuum leak. Also there have been known issues with the pin connectors on the IAC not making good contact in the plug...
Tired of the cheesy OEM steering on your Jeep. Upgrade to a one ton setup. We offer steering for the following Jeep models. XJ, ZJ, YJ, TJ, WJ and JK. Made right here in the U.S.
https://www.catoctinjpor.com/steering-parts
Jeep JL inner fenders are now posted on the website. These fenders are made right here in the USA, Baltimore Md to be exact. Bolt on installation with minor drilling.
Check them out.
https://www.catoctinjpor.com/product-page/jeep-jl-inner-fenders
Catoctin Jeep and Off Road, LLC is now offering DIY steering kits. We also have build parts as well. Please check us out.
https://www.catoctinjpor.com/diy-steering-kit
These control arms are built to last. Made from 1.500" diameter solid stainless steel with right and left hand threads for easy adjustment on the Jeep. Flex joints are rebuildable. Good for stock to 4.5" of lift.
Lifetime warranty
Made in the U.S.A.
Jeep TJ Rear Upper Adjustable Control Arms
Brand new rear upper control arms for the Jeep TJ model. Made from 1.500" diameter solid stainless steel with right and left hand threads for easy adjustment on the Jeep. Flex joints are rebuildable. Good for stock to 4.5" of lift.
$180
Shipping = $12
Lifetime warranty
Made in the U.S.A.
For those of you who are installing two speed fans, I am offering an in-line coolant tube with a dual temperature switch. The outside diameter of the tube is 1-1/2" which is a common inside diameter of the upper radiator hose on Jeep vehicles. The set up includes the coolant tube, duel...
I have some overstock flex joints for sale. 3/4-16 tpi right and left hand thread. 1-14 tpi right and left hand thread. All are 1.6" in width that will accept a 7/16" bolt..
$45 each
Will ship $8 flat rate anywhere in the U.S.