My 02' Grand Prix has roughly 80,000 miles on it. For the past few months, I've been having problems with the car's acceleration. 90% of the time it stalls or takes an excessively long time to reach say 45mph. Going uphill it takes longer. Engine light has come on several times, and all I could get out of two mechanics was that a misfire was occurring along with other codes that they failed to notify me as to what exact codes they were. Also recently, a loud, high pitched whistle is coming from around the backside of the intake manifold. I've changed plugs and wires, changed fuel pump and filter, and I'm currently taking out fuel injectors to inspect for clog. Please help me narrow my search for problem down. I think I have to check catalytic converter, O2 sensors, coil pack and vacume hoses
Jan 21, 2006 at 8:15 PM