Blue smoke with one bad injector?
 

I have a 95 powerstroke f250 4x4 that is bone stock.. recently ive been having tons of problems with including horrible idle, tons of blue smoke on start up that goes away in 10 mins, and my rpms fluctate within 200 rpm up and down.. i plugged my snap on red brick in and its saying all my injectors are high to low side open but i can clearly hear the number 7 injector is bad. Then i ran the cylinder contribution test and it says that the number 7 cylinder failed the test. And i just got code p1280 today, any ideas guys? Any help will be greatly appriciated, shes my daily now