My 1991 Ram 50 2.4 Auto 2WD started throwing codes..

I remember someone saying that some of these could be related to a ground issue?

Code 15 - Motor Position Sensor
Code 21 - Engine Coolant Sensor
Code 25 - Barometric Pressure Sensor
Code 13 - Intake Air temp

The truck is tough to start and has a rough Idle.

Any help would be appreciated.

The air flow sensor was changed with a remain last year where the air temp sensor is..