I have a 2000 GT with only 45K miles on it........ all of a sudden I starts working like ****...... it never gave me a sighen that this would happen but it wont full It can't rev past 4K RMP even if I floor it and everytime I go pass 2K rmp it start shaking back and forth and it wont pull hard at all........ it pulls like **** and soudn like it under some heavy load but with a weard sound not like before when it was at low RPM and high gear...... please help