I have a 120r crate motor in a breakout .Its been remaped(super tuner) 9 times over 11months,been on the dyno,has had new plugs,new leads,new coil,new throttle body,new injectors and it still missing and farting and generally running like a pig at mid throttle in 1st ,2nd, 3rd&4th   .At 60km/Hr at mid throttle in 3rd gear ,it is at it,s wourst. It is continously blacking the back plug. Any help out there.

Where are you located? Was the motor installed by a dealer?

Fouling the plugs up by the sounds of it.

is it Fuel fouling them up or oil?

Comp and leak down test, go from there

oh and welcome to the forum

Hi Kevin, where did you get the motor from and what $ did you pay for just the motor?

Oops
Doesn't matter
Should have checked the date on the original post
and it doesn't look like he's been back