I have a 2000 vr6 Jetta making a noise sounds like a vavle tap I took it to many shops sum said it was a vavle tap other said it was coming from button half of motor the car hasn't lost any power since it started making the noise drove it about 500 with it making that noise ND it hasn't gotting any louder or worse but there deff a noise coming from some were can some one tell me of car still safe to drive and dose any one have a motor for sale