Considering a very clean 1985 Eldorado as a weekend cruiser/fun car. The motor is the 4.1 and has been rebuilt 3k ago. The car runs smoothly, drives beautifully, but has really no "get up and go." I have read that these cars are underpowered. On the freeway ramp I pressed the pedal to get up speed, and I heard some slight clattering or popping as the engine built speed -- it was not a metallic sound - and I did not hear it at highway speed, in town driving, or at idle. The car runs beautifully, starts beautifully, no smoking, no leaks. Is this a normal trait of these Eldorados? The owner said the car has always performed this way and really did not even think there was an issue, and he has been very forthcoming on everything else. Thanks!