[Hello all - new to forums but when I read this I thought I might hav a suggestion.
Just this weekend I was trying to clean my MAF Sensor ( on the top of the air filter box) and I damaged it - the result was that there was no spark. Replaced with one from a wrecker and all is OK. - Maybe your MAF Sensor is bad? Watch out though - I don't believe it will come up with a trouble code at Toyota. They spent 3 hours nearly and didn't check it like I asked because no code came up - when I insisted they found it to be the problem.
Hope this helps.