This has been an issue with my 07 Sorento for 2 years. I was taking it to get new tires and I noticed a lag in acceleration getting on the highway but it was fine otherwise. CEL had been on a few days. When I got to the tire shop I shut it off and when they went to pull it into the shop it wouldn't start...it turns over but acts like its out of gas. Hasn't started since then. That day we checked fuel level, sprayed starter fluid into the intake, reset the fuel switch under the hood, and had no luck. Since then we have checked fuel pump, fuel pressure, crank shaft and cam shaft sensors, by-passed ECU, loosened the back catalytic converter and it doesn't throw any codes. We are at a loss as far as what to check next. A friend of ours suggests the o2 sensors because he is certain it's an air-flow issue. Has anyone else had this problem or have any suggestions for us?