I'm all about improving this problem as I too have the same experience as the Op... I just wanna :banghead: when I hear moving up to higher octane. I vowed never to have to do that when I bought a new car... I went from using higher octane in my last Isuzu because it would knock crazy if I didn't & am so disgusted with gas prices (yea I know, they are down... for now), but living in a large metro area you have to have some get up and went with your vehicle. I've managed to compensate, but **** if I don't have to almost stop to get the jump on traffic. I know, I know M/T, but there to I wasn't going back to that either... maybe I'm lazy, but I want the car to do the work, not me, but I digress.I had that happen when it got really hot outside. I floored it and it choked pulling out into traffic and I thought I was going to get T-boned.
1) Spark plugs gaps - remove them and adjust to .035". There's a huge thread on this issue.
2) Run a higher octane gas than 87.
Throttle response was MUCH improved after the first one, mildly before the first by using higher octane.
NOTE: TSB, re-flash... really, that is the 1st I've heard & Monday @ the dealership it was not mentioned.