hey fellas. need help. seems as though my d40 hits boost and then looses pressure. it seems to come on later than normal too and often boosts up again later in the rev range. kinda shits me cause theres no boost when u really need it. have checked vac lines and hoses and have recently replaced solenoid which fixed other turbo issues. the water pup also shit itself but that has now been replaced. was thinking it might have something to do with the egr but not sure. any advice would be much appreciated. thanks in advance