| Any sign of leaks? The adapter on the front right of the transmission is known for leaks, can push fluid up to the TCM and trigger limp mode. Get a code reader and plug it in, see what codes you get.
As silver says, how many miles? If you've not serviced the transmission, get it taken care of.
Other possibilities are an obstruction in the air intake, from the initial opening by the radiator all the way back. Critters like to nest, vermin can crawl in and even chew through the air filter. Check all that out. (A badly fouled MAF can trigger limp mode too.)
Do the physical inspection but the big thing is check codes, that will at least give you a hint of what you're looking for.
Take care and enjoy the ride,
Greg
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