Howdy, I am currently at my wit's end with this powerstroke. I just replaced the oil pan and gasket. Then I put it up for sale, at which point the check engine light came on and it began loping. Now it starts and runs smoothly for about 10-15 seconds, then the light comes on and a few seconds later it begins loping again. When loping, the throttle is very touchy, a little movement gets a big reaction. It doesn't lose any power(actually feels like it has more power), but acts like it has an engine brake when trying to maintain speed. I've been battling it for about a week now, just throwing sensors and filters at it, but don't want to spend $1500-$2000 on a scanner I'm only going to use once. Please help, any advice will be greatly appreciated.