Have a 1999 Pontiac Sunfire. 2,2 4ci. Evey so offten the car will want to bod down on take off. will not stall, but will act like it,s runining out of gas. You can stop. Cut engine off. Let it rest a few minints. And it will run alright again. It could go another 1000 miles or so and do it again. The engine light does not come on. Have had it in the shop a couple of times. They can't find anything wrong. Have supected the tranmission may not downshift some times. My question is this. Can a sensor stop working some times and then work again? Have ofcourse changed the gas filter, air filter. Put new plugs in. Kind of runing out of ideas, What would be some good advice? Thanks, John.