I need some advise from those who spray large doses of nitrous on a L98 style engine.

I am getting pretty consistent nitrous misfiring between 4,500 and 6,100 rpm. But only when I run nitrous. N/A it runs like a dream.
Air fuel ratios don't seem to be the issue because it happens anywhere between 11.2 and 12.5.
I did have one run where it hit 13.2 and it didn't misfire though.

Originally the tach needle would jump when the misfire would happen. A loose connection on the tach signal wire was fixed so now the tach is fine. However the misfire still happens.

When I pull the plugs they look fine.

Here are some details:
Miniram intake
F.A.S.T engine management
11.2 compression
AFR 195s
2 different sets of autolite plugs (1 step colder) .035 gap
Taylor 10.4 mm wires (New)
MSD 6AL
Accell cap, rotor & remote coil.

Any suggestions would be greatly appreciated...

 

How much are nitrous are you using?

 

I am using a 150 shot.