Quote:
Originally Posted by Fleethammer
Pretty sure the tune doesn't cause the issue; it's revealing or exacerbating a design flaw in the fuel/spark delivery systems (a bad coil pack for instance). A modest horsepower increase shouldn't make the car shut down, especially if most other 135 owners running the same tune aren't having the same problem. I haven't seen any case where a stage 1 tune has required upgraded coil packs or injectors yet. There is something wrong with the car that would become more apparent over time if I ran the stock tune; the Cobb tune is making it show up sooner than later.
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It's coils, sparks pulgs or both. You are about at that mileage where your plugs should be replaced anyway. It's probably just a coil or two...replace and enjoy.