Wheel hop during acceleration

I have a 1999 Buick LeSabre Limited, 3800 engine, with 95k miles. I've had the wheels balanced a few months ago to remove a high speed shimmy and that seemed to fix that problem. Recently during mild acceleration I get what feels like wheel hop. If I back off a bit or just accelerate with less power no hop. Once rolling, if I floor the accelerator, no wheel hop. Could this be a strut issue? When should they be replaced? Nothing else feels loose or broken in the front end.