95 w/ 120,000 AWD Astro Van Tune-up results

While sitting at a stop idling it starts running rough sometimes almost wants to die. It appears to be running rich so much that it burns your eyes if window is down or if standing near. Gas mileage has decreased and takes a bit to get back up to speed. Somedays it is not bad at all. Returned to shop that did work and they gave me kind of a run around and claimed it was fuel injectors leaking. It is NOT ever hard to start as he tried to tell me. He wrote down Fuel Trim 118, LT Trim 108. But was told it was just numbers that meant nothing :roll:. Having more problems with others services they did to my van and this getting worse I complained to company. They had another store inspect and they said I needed a new tranny that it was slipping and that is my lack of power. They never even ran a diagnostics on it. I don't even know if they ever did the tuneup for they seem to be sidestepping the odvious. They also replaced both idler arms now my steering wanders. Are these the same size normally because to me it seems the right one is larger and new, while other is much smaller and the boot is very hard? I don't seems to get any help from them and we spent alot of $ to have my husbands car break down right away do to the work they did as well. Any suggestions : I really love my van :cry: