My ram van 1500 2001 v8 (82,234 miles), is not idling properly, sounds like it’s chocking at low RPMS/ when I disconnect the vacuum reservoir for the cruise, it now works at low rpms but not high rpms. I did a tune up about 15k miles ago. I thought my fuel pump was failing so I swapped it out. I have also changed my air filter. I believe it’s running rich, but I’m unsure how to fix it. Please help me. Before I disconnect the vacuum reservoir it would die at low RPMS for example I would die when I would let off the gas to stop at a red light. The strangest thing was that some days it would be fine and others not. I’m so lost.