I bought my super low mileage GT last year and have been completely happy with one glaring exception. I'm a very conservative driver for the most part. The car is very strong in low and mid-range acceleration but very flat above this; doesn't sound right either with its 'blat-blat' sound accompanying the flat acceleration. I've always suspected the intake runners weren't opening up properly or the exhaust was partially plugged. No 'check engine' light is illuminated. The top end acceleration is no better than my Ranger 4WD or my previous V6 Mustang. I'm rarely home to drive it and money is an issue at the moment. Another forum stated this could be the result of a bad actuator/ sensor? Another comment in the same thread said he was informed he would have to buy a brand new manifold? Hoping someone knowledgable will point me in the right direction.