With spark plugs, no not really. Some people claim you might see a very slight increase in hp (like 1/2 a HP) with high performance sparks, but I doubt it. This is of course comparing new sparks, if you have old worn out ones then you could possible see an improvement. I'd take it to a shop, make sure the motor is running properly. If you're running larger tires + a lift, this is a common problem with the 2.5L engine.