Have a 95 v6 that has baffled every mechanic that has looked at it. Car has hesitation issues accompanied by spark knock and there is a total lack of hp. The worst part is after the car slows down (but doesn't come to a complete stop) and then tries to accelerate again. The car will not accelerate for anywhere between 5-25 seconds and then it will SLOWLY begin to increase speed. Transmission expert says it is not transmission, engine expert says it is a fuel starvation issue. Any ideas?