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I have a 2000 Toyota Tundra v8 Trd. It has 340,000 miles on it . I’ve had this truck for 3 years no problems till now. I just replaced the coils and the spark plugs. But now when I go to drive it when I press the gas the whole truck will vibrate like crazy I know it’s not the u joint I just replaced it. Also the 4 wheel drive light kept blinking but my truck isn’t in four wheel drive and to be sure of that I took off the front drive shaft. Any thoughts as to why it shakes?
 

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If a coil/plug doesn't fire, it will "shake like crazy". Been there, had that. So, if the problem appeared after replacing the coils and spark plugs, I would suspect a bad coil, bad plug, bad installation, or some combination thereof. The ECU should throw a code meaning "misfire on cylinder [x]".
 
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