Vibration in 1999 Q45t

[TRUEST]

I dont know what the problem may be but when I drive this car, sometimes it vibrates, other times it doesn't. when I start speeding, i dont sense the vibration but when i suddenly slow down thats when i feel it. i feel it on my right leg and even on my left leg which isn't, obviously, on the gas pedal.

also, after slowing down and pushing the accelerator again, it hesistates for a split second then it speeds off

does anyone have any idea what this may be and how much I should be expecting to spend??

(although the car has almost 173000 miles on it, i bought it because its a car i know I will keep liking years from now

[Q45tech]

Tires, wheels, brake rotors, rubber isolation mounts, road surface roughness interacting with all the afore mentioned items.With 173k you should have replaced everything by know multiple times.

I doesn't ride like new unless everything is new!

[texasoil]

first place to look is the engine mounts 2 under engine, one under rear of transmission.