My 95 Sable struggles and has no power. It will only go 45 MPH at 3000 RPM.
It shifts to 2nd at 3000 RPM at 25 MPH and then to 3rd at 3000 RPM at 45 MPH.
There is a rattle sound like a loose piece of aluminium when I accelerate.
While in park, the engine will rev up to 4000 RPM and then there is a vibration,
but it will only go up to 3000 RPM while driving. The car got new plugs and pcv valve about 6 months ago and a new speed sensor, and ran fine till this weekend. I changed the fuel filter this morning and still have the problem.