Hi guys new to The forum and after doing much work on my 2002 Durango SLT troubleshooting has drove me up the wall so maybe this will be a place for people with actual knowledge to actually help you. I'm no technical expert but I've had to learn quite a bit on the fly and have reached a couple walls. First of all there is a cap on the intake manifold that says do not remove I have never touched it but it ended up being gone right after I replaced the TPS sensor not long ago. From what I've seen, looks like it was where the IAT sensor should go but there was never any wires going to it like I said only a plastic cap saying do not remove. Not wanting an open hole on the intake, I did the obvious solution and suck an upside-down primer bulb in the hole. ?. I guess my question is, is that spot for an optional upgrade, or used for a different model with. That engine?