05 BAD Viration

I have recently noticed a horrible vibration but it seems to be only under acceleration.. Thought maybe it was tires, but it does it at all RPM levels under acceleration. Once I let off gas and cruise it settles down quite a bit but can still notice it. Going up a hill it's almost violent. Going down a hill coasting it's as smooth as can be. Auto tranny BTW and never any problems with it. Any ideas where to troubleshoot?? Thx

Accord EX by the way

It could be bad plugs, wires, or distributor (if you have one).

It could be a vacuum leak.

Good luck,

Sam