the car has been converted to run ofac, its a zetec bottom end now the problem is the car wont rev past 4k, it just hits a a dead end

everything on wiring side is fine, plus fuel and spark

the only thing is its running a zetec flywheel

so would the flywheel cause it to stop reving past this?

i havnt seen a zetec and frst flywheel side by side, i know one is square and one is circles but unsure if the pick ups are the same

if it isnt flywheel anything else to suggest looking at