Engine Dieseling - Options?

@RustyRatRod - I already set the car on fire once, wont do it again - will check and see what I find

@jpar - maybe it was wishful thinking but it sure seemed like the octane boost helped, but it was probably 40ish in the garage yesterday, car was running around 170ish then, would climb to 190 off with the heat soak - I looked a little and couldn't find anything around me that has any high octane - still more looking to do