I've got a misfire. It only comes in further up the rev range.

The car has a stage three set up with switchable boost between 10 and 23 psi.

When on 10psi the car stutters lightly at around 5500rpm - not very noticable.

When on 23psi the car stutters heavily from 4000rpm onwards - very noticable.


Any suggestions?


My thoughts were;
1. Spark being blown out
2. Crank sensor faulty


Cheers,
Pete.