saltman

I have a 98gs 300 with 95,000 miles on. my wife drives everyday. I jumped in it the other day and the car just feels like it couldnt get out of its own way. very sluggish throttle,shifts are little delayed and rough. it also feels like the drive shaft has a little play in it as it kicks in to passign gear, you can feel it in the rear. I have always ran sythenthic oil,filter,air filter every 4000 miles or so. Had lexus do the 60K service(rip off) on it. I also put denzo irididium plugs at 60,000. I know I can do the 90k tune up, but come on that tune up needs work miracles. Thi scars runs like a camery 4 banger. it idles perfect,gas milage is ok and it does run throught the rpm range, just sloppier than I ever remember, Anyone have tune up that gave them new sense of power. Maybe voltage stabilizer. Please help.