The last 2-3 days, I have started getting this horrible vibration all over the car when I take my foot completely off the accelerator around 70-75 MPH. As soon as I gently tap the brakes when the vibrating starts or push the gas pedal to accelerate, the vibration disappears. So I have learnt to drive without taking the foot off the pedal suddenly at highway speeds, which is not easy in rush hour traffic
Is a wheel balancing and alignment required? Or is there a chance there is some thing in the front-end suspension that is out of whack and might need to be replaced? My tires (Bridgestone Potenza 960 Pole Position) have 10K miles on them and I do primarily highway miles.
I did have new front pads and rotors put on a week ago. Another incident was that I hit an undulation in the road (no pothole) around 10 days ago at 50 MPH and thinking something might have screwed up the right passenger side after that? The car handled fine after the bump and no vibrations but am wondering if an incident like this might take a week or two before the vibration shows up?
I was planning to go to Firestone for an alignment and wheel balancing /rotation but wondering if that will fix the problem, or do I have a bigger problem with the car?