probably fuel filter, since it happens when there is lateral force on the car, which pulls the fuel, and if the filter is clogged, lowers pressure.
if you havent replaced your filter(s) in the last year, you should do it now.
the +2s arent as bad as the +4s, but they arent the best. NGK copper or Denso iridium plugs will give more performance, the NGK costing less, and the Denso costing more.
if you have $$$s to spend, the Denso plugs are a very nice mate to the individual coil ignition systems.