Code 22 - Engine Temperature Sensor voltage too low.
Code 45 - Transmission Overdrive solenoid circuit fault, open or shorted.
Code 51 - Lean running condition.

Since idling is erratic, the recommended starting point is to have the throttle body and IAC cleaned.

Answered by KHLow2008 (expert)
39,855 answers provided

Thanks KHLow2008. I will clean both and see what happens. For those of us with less knowledge here is a good link with pics on cleaning the IAC for the 1995 Dodge van: http://dodgeforum.com/forum/dodge-ram-van/68174-diy-how-to-clean-the-iac.html

Response from ldinbigd
1 question asked

You're welcome.

If you google for IAC on Youtube, you would get videos on how to clean the throttle body and IAC.

Answered by KHLow2008 (expert)
39,855 answers provided

Yes, I did google and found a neat tool -Run Rite Intake Snake, but I will fore-go ordering it and see what the parts store has.
ldinbigd

Response from ldinbigd
1 question asked

Carb cleaner should be good enough to perform the job but the quality can mean getting the job done faster and with a better result.

After using carb cleaner the engine is going to struggle to start for a while so don't be alarmed.

Answered by KHLow2008 (expert)
39,855 answers provided