I would suspect a flakey fuel pump before the ignition.

There is no cap/rotor/distributer to worry about, and if one of the coil packs dies, it will still fire but run really bad (not completely dead).

From what I've seen/heard, when the fuel pump is on its last legs, a lot of times it will intermittently work and not work before it completely dies. I haven't looked into it on the T yet, but there is probably a way to jump something to get the fuel pump to turn on like on the older Toys to verify that its working.

'97 4Runner, '06 F350, '86 4Runner, '05 WR450
http://home.4x4wire.com/erik