When the car is at operating temp, and i'm at a red light for instance, the moment I hit the gas pedal and take off I hear some sort of weird groan for about 2 seconds, or so, coming from under the front and rear passenger seat side of the car. After the 2 second period the "groan" will go away, not until it comes back again when I come to a complete stop and take off again where the same symptoms arise. What is this "groan" coming from?? And why is it groaning only when I take off from a dead start??

TIA.....

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Agron
1989 300E
Monotoned Smoke Silver
97 Style Replica E420 Rims 205/55/16
Euro Headlights
Clear Corners
20% Tint
12" Sub-enclosure