Put in some racing fuel (103 octane or higher), then tell me if it's still sluggish.

I'll let you be the lab rat for saying that 87 octane gives you better gas mileage. I'd rather put bleach in my oil...

Back in my racing days, a wise man once told me this...."Your car will always run the fastest it ever has right before the engine blows up" I and most of the racing community have our reasons for that as well...