my 97 ranger revs up in between shifts. It has a 3.0 with about 150000 miles,I replaced the air idle controll valve,also the tp senser,newspark plugs and wires. Ive cleaned the throttel body,and lubricated the throttel cable,replaced the clutch,presureplate slavecylinder. Im running out of ideas. one more thing i cant find a vacume leak anyplace.can any body help me