Just bought a 2000 project 4.0 auto. and the Leak Detection Pump and filter are missing. Was there any version of the 2000 tj where these weren’t installed? Jeep runs ok ( has a little skip sometimes) so wonder if I need to add these back. Lots of them on ebay. You can see in the pic where it is supposed to be and the vac line that goes to the pump is capped off.