I have an 89 caravan 2.5 four cylinder and it runs bad even after new cap rotor plugs and plug wires and timing set. Someone told me it might be the throttle position sensor. I do not no a whole lot about fuel injection. There is no engine light on and I unplugged the sensor and it runs exactly the same. Sometimes high idle sometimes low, when I step on the gas it stumbles so I have to feather the pedal to get going. Any ideas would be appreciated. 269charger