2005 Mustang GT with 87 diablosport tune, causing misfire??

[Jordan]

I was driving my car the other night, a little harder then normal, and i wanted tot ake it up to top speed. At about 135MPH my engine light started blinking, which means the engine was misfireing...i have the 87 diablosport tune uploaded in the car. Any idea whats happening? Could the tune be causing this?

[sohfast94]

Any codes?

[concoursd]

what was your speed limiter set to? stock speed limiter is 140 mph

[Jordan]

The tuner is showing no codes, and i believe the stock speed limiter is set to 149MPH/240km.h on the 05+ GT's, and i hit about 136 when i noticed the engine light blinking, meaning misfire. Maybe i just got some bad gas, not sure.