I have a 1996 Plymouth Grand Voyager 3.0L with a 3 speed auto tranny. On Monday it went into limp mode (I think). While driving it, it dropped down into 2nd gear and would not shift back into 3rd. It has the following 3 codes: P0743, P0505, & P0108. What do these mean and how to fix it?

Thanks!

 

The P0108 is a map sensor code, P0505 is a IAC motor, and the P0743 is the lock-up solenoid. The lock-up solenoid is screwed to the valve body and the governor valves maybe stuck with debris, causing the transmission not to either up shift or down sift.