Not Boosting

[DR R33]

hey everyone my car hasnt been the same in the past few weeks. it hasnt been boosting properly some days its normal.i cant figure it out ive checked my fmic 2 see if der are any leaks nill. should i get a diagnostic done on it, would this be able to tell me whats wrong with my car? my cars a auto. on the freeway i was doing a 100kmh and it was reving at 4 grand im like wat the hell its normally below 3, i planted my foot down and it felt slower than my old falcon.

[sweetr33]

odd thats the overdrive wasnt on>??? tranny issue??

[DR R33]

the overdrive wasnt on dats the werid thing??, it could be the tranny. ive put some oil in it and it was fine.but like i sed it comes and goes

[Daniel R32]

Check your bov, my old bov was letting air out at idle, turned out to be the vacume line was sucking the valve open which = no boost

[ANK]

i think its the trany mate my vl does the same thing box needs to be fixed