My audi s3 AMK only goes past 6000rpm in first and second gear. i have replaced maf sensor, spark plugs, n249 delete, turbosmart dv, replaced all rubber hoses with silicone. put on brand new n75j version. car seems to pull like mad and just dies after 5800-5900. i have no engine fault codes what so ever. someone help???!!!! i dont no where to look next.