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This problem is called blow-by.. There could be a few different things that have caused it but the cure is the same... New piston rings are needed..
Probably pay to rebuild or replace the whole engine.
Yes. It's a real pain in the ***. You're going to have to remove the intercooler from the top of the engine. Just be glad it's an air-to-air intercooler, not an air-to-water "charge cooler" like mine. Once it's off (pour some gas in it and swill it around to give it a bit of a clean), you can start getting the bolts out to get the head off. Take the spark plugs out first. I don't *think* you need to remove the inlet manifold on this car.
For further help & advice go to gt4oc.net. You don't have to pay for a subscription, there's plenty of resources and if you post nicely in the free area someone is bound to lend a hand. If you're going to be doing a lot of self maintenance on your GT4, it's probably worth the $$ for membership!
There is no problem with your computer box, it says 3S-GT on it, thats the way toyota did them back then. same with the 3S-FE (says 3S-F on the comp. box) and 3S-GE (3S-G on comp. box.) i dont recommend removin the cat. you will get defected (or waht is equivelant to a defect where you are) due to smog and stuff like that. Turbo timer is wired to the igntion system, no problems there. and as for gauges: get a pro to install them, but there should be zero trouble.