Well the first thing your doing wrong is buying any additive for your fuel, these do not work, i say agin DO NOT WORK and in field tests and in most cases have actually reduced the BHP by as much as 3%
Try running down your fuel to nearly empty, filling it right back up to the brim with no additives and see how it goes. if it still has the same problems you have described it could be the O2 sensor of a Failing Coil Pack
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