Clunking in rear?

[FunWheelDrive]

Hey, i'm new to the forum i just bought an 88 Turbo Targa Supra 5spd. The car is mint shape except the power locks don't work. And the problem i'm about to discribe.

I read alittle bit (i used search) and read something about the electronic suspension lights flashing it's a bad thing.

If i'm driving the car on a flat road, no side to side cornering or hammering on and off the gas will cause the rear end to clunk. It's only while going over bumps. The clunk seems to be alot worse in "sport" mode.

When i start the car and if it's in normal mode, i have 2 lights flashing at me, the closest one to the gauge cluster and the one furthist away. When i put it in sport mode, non flash. They're on solid. I looked under the car and tried to move stuff and everything seems pretty soild. Sway bar had no play by the looks of it and all the bushings seemed okay.

What do you guys think? The clunk isn't super loud, but it's definataly noticeable.