Update: I got my tires balanced last Friday on a Hunter road-force machine. It cured about 80% of the vibration.

Coasting/cruising = smooth

Accelerating while turning right = smooth

Accelerating while turning left = vibration

Accelerating straight = vibration (less than turning left)

I'm wondering about some suspension component now, maybe I'll post this in that forum too.

1999 Contour SVT #1966/2760, Silver Frost/Midnight Blue Koni Kit, Mille Miglia MM-S rims, B&M shifter, Stazi mesh, SFCs, optimized Y-pipe & TB, SS break lines, K&N drop-in, Infinity Kappa speakers, MTX amp/sub