Hello all, I recently bought a 1991 f250 7.3idi and I’m having an issue with a my rpm’s surging when I switch from drive to park (surges to about 2k and stays there). Also while I’m driving it feels like the truck wants to just keep driving if i let my foot off the accelerator, the rpm’s even rise about 100 when I take my foot off. Any help is much appreciated thank you.