engine vibration
recently when i drive and start to accelerate above 4000 rpm mark, after that at abt 40 miles/hour or 60 km.hr and below i could feel my engine vibrating....upon pullin to the side and popping the hood i could literally see the engine vibrating quite violently. but this does not happen when i do not accelerate pass the 4000 rpm mark....i suspect is the engine mountings worn?
thanks



