Wow, mine is doing that too. I also lose power whenever I accelerate with some determination, then all of the sudden the engine bogs down and loses 80% of it's power. Then I back it off and it seems to go back to the way it was. I noticed it is worse when it is hot, say over 80 degrees, and runs a lot better at that when it is cold out. The coolant usage is quite curious as well. No coolant in the, thank goodness. I saw one video on youtube where a guy found a leak at his flex-pipe, which is part of the cat system.https://youtu.be/jngmRVXCoV4 I haven't got a chance to peak at mine. I also found a guy that found oil in some connectors, however, he didn't bother to identify the parts he was talking about, and I don't know enough to go by what the heck he is pointing at or what he is saying to figure it out.So here is a weird one.............my CEL has been on for over a year now, with P0420 being the main code that would not go away (other codes, like 'random misfire', were cleared with new plugs and coil pack). I live in Taxifornia, and they want a ludicrous sum of money for a 'CARB approved' catalytic convertor ($1300 !!!! vs about $300 in the other 49 states), so that's why I have been living with the CEL being on. Anyhow, my 2014 Cruze 1.4 ECO started consuming coolant the last few months, with no obvious leakage observed on the ground under the car, and only the rare occasional odor. I finally got tired of topping off the coolant reservoir bottle 3 times a week, so I had my (trusted) mechanic take a look; he installed a new radiator, upper and lower hoses, thermostat housing, and coolant overflow bottle hose. Lo and behold, the CEL was not only off after the repair, but so far it is STAYING off. I am scratching my head trying to understand how a coolant system issue could throw up a P0420 code. Thoughts ?