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When i had my TB42e i had problems with the idle as well, nd i played around with it a fair bit, there is a special way to do the idle adjustment if i can remember correctly, defenitly set the TPS to 0.4-0.45 first cause that rectifies the smooth change of the auto,
then u have to disconnect the plugs on the idle control valve, its where that black screw is, aswell as the TPS plugs ,should be 2 plugs on either one,
start the engine, adjust the idle up, by whinding the screw out i think, turn the engine off connect all plugs, start it up again, the revs should drop, so just keep playing around with the idle followin thos steps, im not saying that its the problem but its worth a try,
another thing it might be it the MAF sensor, disconnect while the engine is running if no change it could possibly be it aswell, if a vacum leak grab a tin of WD40, while its running spray all over hoses, down beside the inlet manifold, just hope its not a manifold gasket lol, pain in the a**
Hope u figure it out mate
Scott