i have a 03 oz rally it has 231000 miles on it.the other day i was driving and the car started to shake and the car started to loose power. i got it home and looked the engine is shaking bad and when i try to drive it i get on the accelerator and the rpms go up but the car doesnt go much and it starts shaking. i replaced spark plugs and replaced one vacuum line also checked oil and coolant and its all good.if i just let the car run its ok but as soon as i go to drive it is when it starts. it doesnt do it all the time its intermittent. can you guys help me out any help is appreciatted.