There's something important to remember about jumpering the connector to set base ignition timing. That being the computer will ignore you if there are error codes.

So if the ignition timing doesn't change when you jumper the connector, you've got a component problem to fix.

Conveniently, that connector is also a diagnostics connector. Jumper it with the engine not running, and you can read error codes, via the check engine light as I recall. You will probably find it telling you there is a problem with the TPS.

Another entertaining trait of the 22RE engine is the tendancy to have a surging idle if the cooling system is low.