Ive changed the map sensor, idle air control, and throttle position sensor. Throttle position sensor has been defected out 4 times. I have tried shifting it all the way left and right and every where in between. Occasionally van just wont start and throws these codes

 

You need to do some testing rather than throwing parts at it. Four TPS is ludicrous.
What is the TPS at KOEO (scan tool)?

 

I changed tps and warranted it so it didn't cost me anything. I have changed the battery, battery terminals, cleaned the main ground for the battery to frame. All connections I have cleaned or changed so far have dielectric grease. I will clean all ground wire contact points, check voltage from battery to engine as ground, and positive post on fire Block to battery ground then engine ground then frame ground. I will touch base after this. Also the idle air control valve gave a code and map sensor gave a code. That's why I changed those and code has gone away since.

 

I added grounds and codes went away. Van starts