Hi i am new to here and this might be a repost problem. I am just frustrated to no end with this problem and got news today that was not what i wanted to here so here we go

Last Thursday the car ran fine. i shut it off had lunch got back in it and it started missing real bad, with a flashing check engine light. I took it to a local shop to have scanned and they told me the number 2 fuel injector was bad. I brought the car home replace the fuel injector along with a new pcv valve and plugs. The car ran worse. I tore it apart again and switched out the fuel injector and replaced the number 4 injector. The car still missed but got a solid check engine light. I took it ti another shop and was told the car has spark and compression they flushed the injectors and they all work properly. They said the number 2 cyl. had a flat spot on the cam and the valve is bad also. He does not now for sure but assumes that is the problem. When I drove the car home from him the car does run 80% better than it did. I don't his this is true on a car with 55,000 miles on it and is well maintained. So any advice would be great I am thinking a vacuum leak or maybe a coil pack ?

um, what?
im so lost, i ahd to reread it three times, and im stil confused.
why would you replace the number 4 injector if it was working?
the flat spot on the cam doesnt make sense to me. lso, if the valve was bad a compression/leakdown test would more than likely show it.is youe check engine light still on? when it comes back on, take it to autozone and have them scan it. its free, and write down what code it is and let me know.