If it seems to be running good, it may be that the catalytic converter is starting to get plugged.
Does it seem like the motor is holding back or are you hitting the rev limiter? Or maybe it could use a tune-up.
The cat is my guess too. Your Triton should run 70 without even trying.
I say, drive it till u get a check engine light and see what code it throws u or do a live diagnostic
Just changed the coil packs in my pick up..drives a little better now but when I floor it it want go.. and want go over 70...
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