My 2007 nitro has started for some reason (not all the time) loosing all power, as though it get to the tubo boost part and it don't kick in? About 2000rpm and it has an auto box so when you hit a hill you could get out and walk faster! Turn the engine of wait a minute and all is well again? I have noticed the trans or engine together have been a little jerky lately and a whooshing noise when you pull away with acceleration from the area I would say behind the throttle pedal, that is where the cat is??? It has 41,000 miles on he clock. Thanks for any help received in advance from the UK.