On my 93 5.0 yesterday my car again fluttered but this time the check engine light came on and I noticed that with the key in the on position the fuel pump would not shut off, I know that they cycle with the key on for about 15 secs and then turn off till you go to full start cranking. So maybe my problem is fuel related? Today it runs fine till who knows. the engine light is also off. Bad relay?