HELP! Im lost. Tried everything

2009 gade, 840 with a pc3 everything else is bone stock.

Bikes is running on one cylinder at idle and mid throttle. Anything over 3/4 throttle the second cylinder kicks in. You can spray a little bit of gas in the intake and it will start firing on both at any throttle position. Bike runs like a raped ape at WOT. At around 2200-3kRPM the bike will back fire through the intake and spit and sputter really bad.

Here is a list of parts ive changed.

injectors 2 sets
injector harness
stator
intake & throttle body
all the sensor on the throttle body
cam sensor
coil pack
fuel pump has 50psi
new ecu and pod
check timing a few times
speed sensor
kill switch
the bike has 185 psi on the rear and 206ish on the front have NOT did a leak down test. Bike runs a heck of a lot better with the pc3 hooked up.

Im down to replacing the main harness and the fuel pump before i pull the motor out and pull the rear head off to see whats going on.

:th_smiliepullhair::th_smiliepullhair::th_smiliepu llhair::th_smiliepullhair::th_smiliepullhair: