Hey guys I’m new here, i have a problem with my ‘95 EF Fairmont auto. When I select D it stays in neutral unless I give it some revs then it will jump into gear. Same with R I have to rev it a fair bit to get it to engage. While driving under power it’s fine until I take my foot off the accelerator, slow down for a corner or come to a stop then go to takeoff again it feels likes it’s in neutral until the revs pick up and it jumps into gear? Someone suggested a new IAC valve as they’ve heard it can cause problems like this especially in a 5sp “rev hang” fluid is fine smells a little burnt, however I’ve been told to try this soo I may duck down to my local wreckers and see if I can use one to test. Otherwise has anyone else had this problem in an auto before? Car has 350000k’s on it but motor was replaced with a 180000k one (with receipt) box was fine but the cars been sitting for a few years and I only started to fix it up recently. Any ideas? Thanks guys appreciate it.