98 GP 3800 that just started making a whistling sound near the left rear tire. I'll also add that right after starting it up, I have a rough idol. While driving the whistling sound continues. When I stop the car and leave it in gear the idol is fine. Put it in park or neutral and the rough idol returns.
Am I guessing correctly that the fuel pump is going out? If so how difficult is it to replace it? If I am off what else could it be? Let me know if you need more info to help diagnosis the problem.
Thank you in advance!
