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Go buy GENUINE TOYOTA plugs, wires, cap, and rotor.
I know two toyota technicians who work at different dealerships and don't know each other, so this ain't just two buddies workin down at the auto dealer. From what I hear this is farily common among Toyota (And japanese mechanics in general):
They'll use autozone coolant, fluids, whatever. But when it comes to the engine components, NOT ONE of them will use aftermarket equipment. I found this out the hard way after I went out and got 'performance' plug wires, bosch plugs, and autozone cap & rotor when I hydro-locked my enging. Lo and behold, I had a miss at idle and then at 4k+ RPM.
Guess what? It went away as soon as the toyota stuff got put on. There's a reason that Toyota stuff costs more than the 'performance' aftermarket. I'm not saying that this WILL cure your problem - if it's mechanical and not electrical, then it doesn't matter what plug wires you use, but it's somewhere to start, and it happened to me, and that fixed it...</font>