something feels loose

[Schoolteacher]

Hello I am babysitting my friends 2004 ctsv while he is away. I noticed that when I picked the car up that when you shift gears and hop back up on the gas the car makes a slight knock in the drive line somewhere. It feels like a loose control arm or wheel. I jacked the car up last night and pulled all four wheels off and crawled all over the bottom of the car to find nothing obviously wrong. I should mention that the car is lowered on coilovers. Is this a common problem? Has anyone else had a similar experience? Any ideas would be greatly appreciated.:confused:

[uvwx379]

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