need help:)

i have fitted a compbrake recicualation as my bailys was realeaseing to much pressure and leeking boost so thought that might be the problem have replace inlet manifold also thought that might be the problem as the seconed nipple at the bottom was snaped of. replace plugs also took all intercooler pipe work of as thought might be the problem but wasant. just listed

owned the car 3 weeks now i brought an ecu of a friend of mine that took the ecu of a car that he had brought which had been mapped for track. but im thinking it might not be as it can rev round to like their is no tommorw but now it is getting more consistent as i can rev round in 3ed gear and at 4 grand it has a flat spot but now ever since this flat spot has occurred its revving round slower then usauall. so i plugged my mates diagnostics tool in and it is throwing up lamber and air flow but i did ant think that a lamber would do this. any ideas welcome as if i cant fix it the car will be going. also the other problem i have is i had a forged re-cert valve on it and it was taken of as it was very very sticky and i had a baileys dumb valve so i put the baileys dump valve on and my car is now making a very loud wining noise at me ermm so i dont no what better to use as the baileys did improve performance slightly.

so if anyone has any ideas to what the flat spot could be and what is restricting my performance much appreciated thanks roleyyyy (i have replace the coils aswell as they wernt done) thank you roleyyyy