Where is the vibration coming from. The front or the rear?? Gearshift maybe?
Any rate if it's the front I would say you should check your plugs wires and airfilter. That should pep it up. Get msd wires and iridium plugs and a quallity gapper. Get a blaster coil and a walbro fuel pump and you should be straight.
Also sluggish: when was the last time you looked at your cat? If it's clogged you'll lose torque.
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