While on a trip with 03 wranger sport FULL of gear.The back seat out. We drove 250 miles stopped for gas. As soon as we exit highway Jp would hesitate on exceleration. It would run great until I would let off gas and excelerate again. After parking afew hours it was back to normal. Same problem coming home. I have driven it to lake without gear in back since without a single problem. Is it possible that the gear in back causes it to get hotter and possible vapor lock? It was mid 90s outside.