I don't see a water pump leak causing running problems unless it's overheating. It sounds like you have a misfire, or sticking egr. I can only offer suggestions as the possiblities could be numerous. If it idles fine, and stutters when you accelerate like from a stop, then I would say you have a cracked spark plug, leaking wire, faulty injector, faulty cap, or something secondary. If it feels like it is running on less than 8 cylinders at all times, you could have a fouled plug, open wire, faulty injector, valve train issue, etc. My advice is to have it looked at by a proffesional, and he should advise to put it on an ocilloscope to check the ignition pattern, and go from there.
Tuesday, April 7th, 2009 AT 9:52 PM