Beams motor in a Hilux? Pretty sure they didn't come like that so we need more info.
Are you running the BEAMS ECU? If not the tune is the likely culprit and it's gonna be pretty hard to diagnose over the internet. In addition to the normal spark and ignition timing these things have variable cam timing, which is cool and all but hard for mere mortals to deal with (and even those with god-like tuning powers if you aren't willing to pay them).
If you are running the stock computer and the person who did the wiring had half a brain you will still have a check engine light output and a diagnostics plug in the loom somewhere. Diagnosing things via the internet becomes a lot easier when the factory toyota computer can tell us what is wrong with it (and given the correct inputs the stock computer doesn't make mistakes like letting the engine ping).
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