ok help is really needed again

ok i figured out the starting problem... now i started it up and the check engine light comes on. And at like 60 mph and a little above the rpms will drop and the car loses almost all power u have the push the pedal hard for it to get goin again. I did mess with the vacum lines so you think it could be a misplaced vacuum line? If not, then let me know on what u guys think. i just installed a new starter... and thats the only thing i have done...