I have a 95 camaro I took it to get a tune up and then it shut off on me 4x like 2 days later. i had to change the massive air flow sensor. Now two weeks later my car is shaking and riding rough why?

take it back to mechanic and tell them to fix what they did wrong doesnt sound like a very good tune up First, if you just had someone give the car a "tune up", I'd look at what was disturbed most recently. If you had new plugs/wires put in, check them to make sure nothing has come loose and that the wires haven't melted from being routed wrong. One bad or disconnected plug wire can make the engine run really bad.