So no new mods have been done to my car since dyno day at Drift Office by ER and today on the freeway in 3rd my service engine soon light started to flicker at higher RPM's could this be cause of a bad batch of fuel or what should i look into?

 

With out a log there is no way to know for sure, could be bad gas. Fill er up and see if it does it again, if its consistent knock I would look into it. If you can log it, anything more than 3 counts consistently and repeatedly needs to be resolved. If you can get a count here or a count there, even 3 counts (but not consistently and repeatedly) shouldn't cause a big problem. I've tried to tune for "no knock" but the knock sensor picks up all sorts of noise that isn't engine knock so that is kind of pointless.

The default setting in tephra is a slow flash for 3-5 counts and a fast flash for 6 or more, this might not be what yours is set to, but that is the default.

 

What do your plugs look like?

 

this, check your spark plugs if they are going bad you will have issues