1998 Dodge Caravan engine problems

I have a 1998 caravan with a 3.0 that ran perfect until one day I ran out of gas due to a bad guage and after I put gas in it it would not idle only ran with my foot on the gas so thinking the pump was most likely at fault I replaced it and like magic it ran great. For about 10 minutes of my test drive but when I turned it off and back on it was back to not running very good. I have taken it to the dealership and they found codes for tps, engine misfire in cylinder 1 and 6, and no communication with bcm they suggested a tune up and ignore everything else and everything would be fine well several months later and done with their ideas I need help now the van runs without pushing the gas but it idles up and down alot and often dies at stoplights any ideas?