What happens is when I am pulling my utility trailer (roughly 1500 lbs) and come to a semi quick stop the engine light comes on. Once I start to take off it feels like the truck is in 3rd gear. Well it is in at least 2nd gear. It has happened since I got the truck back in June '10 but only has happened when the trailer was being pulled. It doesn't do it everyday, but at least 3-5 days. If I turn the truck on and off 3 times while stopped at a stoplight, it will start in 1st gear. But once I stop again, it will start off in 2nd or 3rd gear again. Recently, within the last week, the truck had the same problem without the trailer hooked up. But, since has not done that again. Any help would be greatly appreciated.