Hunting Problem ***please Help Me***

[4dr taxi man]

hey hows it goin? i have a 1989 r32 4door and 2 weeks ago i went for a hills bash with a few mates, and i had a tank of caltex premium instead of the normal bp ultimate, i also had a plate blocking off the bov, i went throu 3/4 of the tank no prolemo and at the end i gave it a goot clutch kick in 2nd and at the next set of lites it started hunting really really badly, so i thugh crap, i took the bov plate out and re connected the bov, still did the same, so the next day i went to my mates and swapped the afm off his 32 still the same it goes from 1000/1100 to 2000/2100rpm. i checked all my intercooler pipes, n still the same, everybody i kno was sorta outta ideas and then a mate came up with the cas and so i went out a bought another one, marked it and swapped it, still the same, . so then i went down and got it put on a diagnostic computer, and the bloke said to me intake manifold leak so today i ripped apart the whole intake manifold and replaced both gasgets, and now its still doin it, any ideas?? any help would be much appreciated thankyou also when u first start it up it sits on 2grand for a few mins b4 it starts to hunt, and the throttle position sensor, if u move it forwards the revs come up to 2500 and if u move it back it starts to hunt again, im apsolutly stumped, any help or any1 i could chat to please pm me thanyou

adrian

[4dr taxi man]

also feel free to call or msg me with ideas, thanks, my mob is 0425313447 also if any1 can help me get it goin ill give u beer

[wolverine]

vacuum leak somewhere?

check all your vacuum hoses, from the front of the plenum to the back looking for splits or check for loose hose clamps again.

[4dr taxi man]

yeah we also made up this adaptor and pumped up the cross over pipe and plenum we put it at 15psi and we could hear a small leak from the throttle position sensor, and 1 hose so i fixed it up and it still ran like shit. its leakn a bita air outta the throttle position sensor so im gonna get 1 of those. try that