If it's an 07 it's probably under warranty, take it to the dealer and have them read the code. The powertrain has a 5 year 60,000 mile warranty.
If it's not under warranty anymore, most auto parts stores (kragen, advance auto, orielly, pep boys) will read the check engine light code for free.
Once you have that code, than we can help. A better place to ask this question would be tundrasolutions.com or toyotanation.com, but really without the code it will be a bit of a wild goose chase.
Best of luck.
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