Someone please help me before I go crazy... I was driving to work today and my car just fell on its face at about 55mph. I scanned it and it was coming up cyl 1 misfire. I replaced the plugs, wires and coil. All brand new. And it’s still misfiring! 😭😭😩😩 what would anyone suggest to try next? I’m so stuck on what to do.

 

Leak down test
compression test
fuel pressure test / fuel injector test

 

Try moving the injector to another cylinder and see if the code follows. I have the same problem which turns out to be a burnt exhaust valve.