Just replaced spark plugs

WOW what a difference. I just bought a 2000 passat v6. Had a slight miss at low rpm, figured I would replace the plugs and let me tell you the difference is unbelievable. Upon removal of the old ones I found 2 different brands of plugs. Both brands were shot. The car has almost 175k and 4 of the 6 plugs were stock. Cant believe it. But it did help me get a great deal on a nice car.