2013 traverse problem. After traveling 150 miles, these messages came up on the screen, "tracation control off, service traction control, service stabilitrak, engine power reduced. and the engine began running rough. I pulled over and shut it off. Waited a few minutes and cranked it up. there were no messages and the engien ran smoothly. Made to destination. drove all day no problem. 2 days later, same issue. pulled over. let it sit and started it up. ran fine, sort of. occasionally, it felt like it was jerking at the tranny. no messages came up. finally, it happened again about 10 miles from home. wouldnt start this time. wrecker came. he dropped it in front of the house and said he felt something pop or release at the brake pedal. It started up. No messages. One dude i found says this could be a dirty throttle body. it sends a signal to the TBS, which send a signal to the computer which misreads, apparently the problem and shuts the engine to three cylinders. This is a big problem since there aree so many previous posts that say the mechanic, or the dealership could fixt it. by the time it got to the mechanic, there were no codes to read. NOTE: this very same thing happened severa months ago. towed it to a mechanic, no codes but his tech said he thought it was the ignition switch, so they replaced it. didnt fixt the problem. HELP!