after reassembling everything in Brianne's truck (88 4.0) the idle sounds rough and it stalls out if you rev too quickly, and if you do rev it up, it'll stall once it gets back down to idle. but it will rev and sounds fine doing it. Ive fiddled with things, checked my vacuum lines again, and swapped out the IAC with no changes. the gas is a year old so I'm thinking of grabbing some octane boost and fresh gas tomorrow and see if anything happens.