I have a '94 E320 with 80,000 actual miles. Bought it 4 years ago and it's my daily driver. I have noticed a chirping sound inside the cabin when the car is in motion. After careful listening, I have isolated the sound coming from the gearshift selector. If I touch the stick, the chirping squeak stops. Let it go and the sound comes back. Has anybody encountered this sound and what is the fix? Thanks.