Tunnie, you may need to push or pull something through the two left hand side ( rocker box to throttle body ) breather pipes.
If these havent been cleaned before the smaller one of the two may well be VERY blocked ! Carb cleaner alone will not shift all the crap inside, so something like a coat hanger ( straightened out of course ) with a bit of rag secured on the end of it, will help scrape out all the crap ! You will be amazed just how blocked this smaller breather can get !
I'm not contraditing an earlier post , but i really dont think its nessasary to remove the throttle body at all !
All the back / crabon build up on the butterfly can be cleaned with throttle body in situ ! Although prelonged squirts of carb cleaner can form a nice puddle of solvent in the bottom of the intake housing , and make for a nice big bang when you re-start the engine
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Also check and clean the air intake pipe work ( black plastic assy, that you uncliped form the top of your throttle body ) as this can get quite messed up too especially in that dead ended chamber between the mass air flow sensor and the throttle body !
I's also like to know why is it the 2.2's seem to get a bit dirty round the throttle body, oil /petrol mix !
Maybe because of the breather pipes , who knows !
Mark