um... that really sucks. You should take it to a different shop that might be more reputable than the one that you have taken it to. Maybe they are supposed to be really good (I don't know). Also, what altitude are you at? It can make a little difference.
You might want to get a fuel pressure guage and regulator so you can tell what you are actually pushing out. You may be getting too much fuel and killing it off. Also get a air fuel guage. You should be at 14.7:1