I know this is a non ford issue but hope someone can help out a fellow stang owner.

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 to 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 think 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 ?

 

What kind of car is it? Maybe whatever it is has a known bug or issue that someone can chime in on.

 

that would help sorry about that 2003 impala with a 3.4