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try reseting the vafc as TODA said to default values,if there is no improvement in car then,
-trace the vafc wiring to where it joins onto the ecu wiring
-u will see most of the wires join onto the ecu wiring,but 2 wires to the ecu have been cut & rerouted into vafc.
-u can leave most of the wiring attached,but just find the white wire,remove the 2 wires leading to vafc from this white wire & rejoin the white wire that has been cut(so that it goes straight to the ecu as it did originally) & make sure it is a good join.
if car runs better now,then u know the vafc is faulty or the joins in the above wire were faulty.
if car still running shit,then u have to look further into the problem.
once car is running good again,then u can reintroduce the vafc & get it tuned professionally.
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why dont u take it somewhere with a dyno get a power run and log the air fuel. kills two birds with one stone. will confirm whether your car down on power and see whether the vafc has been set up properly.
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great thanks for all your advice guys!