Hey guys does anyone know if your check engine light is on will it pull timing out? The reason I ask is when I was at track a while back, I didn't think the car was running the mph it should have [ 127 ]. It's tuned, top pulley, JLT cold air and Ford twin 65 TB. Great weather, DA less than 1000 ft. I know this sounds stupid, but I didn't notice the light on, until next day when I drove it off the trailer. It was first time I had it at the track, it was dark, was having trouble figuring out LC [ maybe that's why it didn't work ]. Turned out being EGR valve stuck. It ran best of 1.60 60 ft, 10.8 at 127. It looks like others with same mods run like 132 mph. I would just like to know if that was it, if not than it sure isn't making the power it should be and something else is wrong. And that was with a tune for 110 gas. I would just go run it again, but I decided I didn't want to beat on it anymore, and have already sold my wheels and tires. So if I knowed with the light on it does pull timing, I would be satisfied that was the reason for the mph. But if it doesn't, I need to look further. I hope the light would cause it to pull timing. lol