i have a 99 model wrx and at full acceleration the car almost feels like it shuts off and jerks, slowing down and then putting the clutch in, the idle nearly drops out and stalls.

Sounds like Boost Cut.

Dirty Fuel, dodgy AFM did your Check Engine Light come on?

i didnt see any engine light wen it happened, its completely stock as a rock the car is, its only got a apexi pod filter and thats it.

might be running lean?

yeah im using my scantool at work tomoz and drive it and see if the afm is reading correctly, and go from there

Its your AFM

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RS Liberty - Because WRX's are only good for parts...

lol join the club, i've had these exact issues for months. i've replaced the AFM, cleaned the iacv, replaced the 02 sensor and reset the ecu, made no difference. i've finally given up and booked it in to subaru friday week (even they had no idea when i was explaining the problems on the phone), they think they'll probably need the car a couple days to diagnose. Will let you know how i get on,

+1 for AFM

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JDM version 3 STi RA

yeah let me no how it goes cheers.

Don't take it to Subaru they will charge you an arm and a leg and
will probably miss diagnose or fail to find a problem.

Book it into a Subaru specialist workshop that will actually find, fix
and charge you a fair price gor their services.

If your north of the river see MMS or ASG.

South of the river just go see Doug aka DTrally at STecnic
in maddington for a no bullshit and quality sevice.

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO