If you go on the highway and you are giving the car gas and it shack, let off the gas pedal. If it goes away, Its the c-v shaft is out of round. If it happiness on decelartion( from a highway speed) its most like this to. If you want cheap oem part( cheaper then aftermarket) go to
www.discoveryautoparts.com . They have everything for a honda or acura. And I mean everything. Motors, trannys, ecu, ex.