My 2005 Gmc Canyon Idles rough.loses power,and the reduced power light comes on?

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I recently took my 2005 GMC Canyon(87,000 miles)2.8L 4 Cylinder to the shop to be put on a computer that pointed to my throttle body because,out of the blue it loses power,idles very rough,and the engine light saying reduced power and traction default comes on when it starts acting up.I replaced the throttle body and it is still doing the same thing it did before putting a brand new on.I can pull over and turn it off and back on several times then it starts running normal again,but not for long til it starts acting up again.No one has no idea as to what could be wrong.Please help!Anyone out there have any idea's?I would greatly appreciate it.