This should be a simple valve adjustment. Take it to any reputable mechanic and have him perform this simple fix and the noise should disappear. I am intrigued, though, because supposedly Toyota engines are equipped with self-adjusting tappets (the little risers that go up and down in a running engine), so it could be a broken valve too, which is NOT such a simple fix, but once it is fixed and $$$paid$$$ for, the engine should be back to normal and purring away. You could also take it to a dealer if you don't have any relaible mechanics around where you are, but they will not only charge you a higher rate for the fix, but will recommend a lot of other things. Caveat emptor, my friend ("Buyer Beware!")
Good Luck
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