12a problem

Ok so I got my 85 gs a little over a year ago and its been probably the most reliable car ive owned, rebuilt motor and 135k miles. I communted to sf but I mashed it from time to time. I let a friend borrow it for a night and when he came back it had trouble starting and would immediately die unless you baby the gas and choke at the same time. Once it was somewhat warmed up i tryed to move it and cant get above 10 mph. It feels like the air/fuel mix is fucked up and a friend of mine told me a more then likely am running on 1 rotor cause his 87 had the same symptoms. Any help is greatly appreciated if the motors blown... ugh im gonna shove it up this kids ass.

Yeah... I'd never trust a friend to drive my car. I personally think the easiest way is to ask your friend what the fuck he did with it and then work from there. You should tell him that he has a surprise and then blind fold him and tell him that you're going to take him to a "party with hot girls" and drive out to the city limits and leave him there.