I'm getting a vibration about 3500 rpm that comes and goes if I slow down or speed up. My steering wheel shimmies alittle while driving, but I hold a straight line with hands off of wheel.I was told the car it was hit in the front. Front end looks to be rebuilt with 944 front control arms not the 924 a-arms you see in performance products mag.. When the car is jacked ,I feel alittle play in the wheel when I pull on it, both sides. Could it be the wheel bearings? I don't know how to tell if the bearings are bad or going bad.