Engine starts up fine and runs fine for about a half hour then starts acting sluggish. Giving it throttle gets little response. If I turn the engine off then right back on, the engine works fine again for a while then acts sluggish again. Turn the engine off and on and the problem goes away and runs fine for a while. Had it in to the dealer already once and they did something to the fuel pump but did not fix the problem. Any ideas before I take it in again?
