odometer read error 3 reset computer now just reads error. would it cause the engine to idle high? replaced IAC. truck runs fine at start shifts late at 3000 rpm then after about 10 miles rpms jump to 1500 and transmission downshifts late and hard torque at stop like i have foot on gas while breaking. getting codes 327-low volts, 628- converter clutch, 121 Throttle pos volts, 536 BOO c-circuit failure, 632-TCS did not change. Engine light is not on only ABS light. no vaccum leaks. also OD light doesn't come on.

 

The VSS and TPS are key sensors and it looks like you have a problem with both of them.

 

Replaced tps on my 93 f150 351 last week now shifts fine idles fine but shudders at lower speeds. New problem to resolve grrrrrrrrrrrrrrrrrr good luck and buy the gasket if you replace the tps throttle housing gasket