My FRS has a few mods inc a sabre 330 map and it mostly it drives great but it keeps loosing boost after a short burst of thrashing. It seems to go almost like a car with 150bhp and misfires at low revs then after a few miles it clears.
Any ideas as I want to do a track day but i'll be a laughing stock as it is

 

Is it overheating?


I saw a car once that kept running like shite when really hot, would keep cutting out etc. Turned out it was the crank sensor that was playing up when it got hot, diagnosed it by blasting it with that freeze spray stuff!