Also, 103s are hard on injectors, the pattern gets ugly pretty quickly (mine did on Mobil Premium by about 40,000miles). Techron in my experience did nothing except make the oil corrosive, buy RedLine SI1 and dump it in the tank to clean the injectors, and run a maintenance dose as often as practical.

The injector pattern is not your misfire problem though.

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Gone to the dark side

- Jeff