yes i have changed the fuel filter, it has the stock injectors. and no i didn't replace the ignition coil. that will be the next thing. how hard is it to install a complete msd6al system in my stang? is it something i could do? and i have since drained the fuel out and replaced it with fresh 93 octane and it is running alot better. i must have gotten bad gas or something. i dunno i am still going to bring it to all american when i get a day off work.