Ive just put my car car back on the road today and it's got a missifre when you nail it. Once it gets to about 4500rpm the rev counter goes off the clock and the exhaust pops and bangs and the car tries to hold back.

On idle the rev counter sometimes jumps a little.

These are the things I have changed over the last few weeks,

Distributer Cap (Genuine Ford)
Rotor arm (Genuine Ford)
Ht Leads (Bosch)
Grp A coil (Woodford Garage)
Spark plugs (Motorcraft pp12's same as what came out)
Phase Sensor (Matt Lewis M, Marrelli)
ECT Sensor (Matt Lewis)

and ive cleaned the crank sensor up.

I did tinker with the boost a little bit, if it over boosts what would happen?

and whats the chances of it being an injector?

Also I'm booking it in for a set up at NMS over the next few weeks, would they look at this at the same time or not?