1994 Park Ave. won't rev at highway speeds
I searched for this issue and pulled up nothing; you've all helped me in the past with this car so I'm hoping you can again. Its a 94 Buick Park Ave. with the 3800 series and when it gets up to highway speeds 50+ the engine won't rev up. It acts like it not running on all cylinders. At lower speeds it seems fine and accelerates normally, only over 50 or so does it act under powered.
Depending on how much throttle I give it at higher speeds it acts like I'm running in rumble strips. If I let up or push the throttle more it stops the rumble strip thing, but no power at all. I just had the winter tires put on it two days ago, I assume they would be unrelated, but just for trouble shooting figured I should mention it. Any help would be greatly apprecieated.
Thank you, Bryan Rexford