ok so i just converted to E85. I have a Single 255 walbro fuel pump and just added FIC 1550cc injectors.

I get this code when starting up my car just about every other time. It reads P0304 "Cylinder 4 Misfire." This is what i dont get tho. It never misfires, idles perfect, starts up perfect drives perfect and a/f cruising is 14.2-15.2 so perfect also

but when i go WOT it leans out to like 14.7-16.0 A/F

the only thing i changed was the injectors and the tune has been scaled for theses injectors.

My idea's about the problem: injector 4 is bad, something just got stuck in the Fuel Pump while running so low on gas while converting over to E85, ECU thinks somthing is wrong just becuase im running 4x's the size injector as stock, Maybe injectors are not scaled right in the tune but really doubt that.

What do you guys think the problem is?

 

Easy thing to do is swap the injector to another cylinder and see if the code moves.

And as for your tune, it's way to lean at wot

 

i just did that. No code has came up yet.. i swapped cyl 4 n cyl 2 so far no CEL