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Usually with the circumstances you have outlined I would say check the timing and vacuum advance module on the distributor. Make absolutly sure that your timing is right on, and then work from there, checking everything (even things you have already repaired or replaced.)
Toyotas are pretty notorious for mass air flow meters and throttle position sensors dieing.
There is a fairly simple process for checking the TPS which just involves an ohm-meter. The manual will ask you to patch into two different prongs of the TPS with your meter and read the ohms value. With the srews holding the TPS to the throttle body lose, you just turn the TPS until your meter reaches the values in the manual.
If you said you have already checked the TPS and it was OK you probably already know this, but I thought I would include it in this post incase you were using a different method to check the TPS.
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B Kent
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