This problem left me stranded the other day. I got my efi live scan tool hooked up and I noticed the timing going to -20 at throttle tip in. The truck will only idle. With any throttle input it is pulling a ton of timing. I happened to unplug the tps and the truck is drivable. I can't seem to figure out why all of a sudden it started doing this.

 

Post the tune so I can look at it.

 

Here is the tune file. The truck has been running fine lately so i'm personally questioning a possible sensor or ground problem.

 

Here is a short log of whats happening with the spark.

 

I'm not sure what was going on, but I reflashed the same tune in and my problem disappeared.

 

Anyone experienced this? The truck just started doing the same thing again