i love the car to bits but whenever i use it for the 1st time that day it drives like a bag of dog turd.

i have a scangauge fitted and whenever it plays up it turns the scangauge off, and once back to normal it comes back on ??

it misfires through every gear and judders about as if its running on 2/3 cylinders. once warmed up and back to normal its fine

im running tubular manifold,
mongoose exhaust,
tuna remap
msd coilpack
k&n gen2 filter
running 22 psi


just for those who may wonder if it could be any of the mods.

also at around 10 psi theres a slight judder

any advice would be great