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There might be someone here that can help you, but I would also post this in the 1st gen forum. They would be
more vehicle specific for you.
 

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I had seven of my ignition coils go bad. Each time I got a check engine light with a P030x code. The x represents the number cylinder that a missfire is taking place at. In order to verify that the coil was bad you can switch the coil to another cylinder and see if the code follows and/or use a multimeter to test the continuity running through the coil. I forget the specs to look for but you can compare 2 or 3 good coil readings to the coil you think is bad. There is a thread on here somewhere that has more info. with the continuity specs. I hope that helps.
 

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The document that 05DC451 posted is exactly what I used for continuity testing.
 

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I had a 00 tundra w/ 130k miles. 1 coil went out. no big deal. 100 bux from the stealership's parts counter, and I was good. few months later, it happened again. Dammit. bought another coil and did the simple math. I could be in another 600 bux. no thanks.
sold it and bought used 06 DC for super good deal, cause no one wanted trucks cause gas was $4.50/gal here in so cal back in 08.
Moral of the story: just be ready, its a common problem for the earlier Tundras.
 
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