x 2 on soldering those injector splices. Get the Toyota o-rings for reinstalling. Make 'em wet with FUEL before install. Mark which injector is which (1,2,3,4), so you know which ones match up with the flow rates.

This is also a good time to send in the cold start injector, as well; nuther gasket.

This is for a 3.0, but still similar:
http://www.4x4wire.com/toyota/maintenance/30_V6/throttle_body/

Don't overdo it with the cleaning spray on the t'body. as Suba suggests for a little preventative maintenance.

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