1997 Oldsmobile Cutlass Supreme Car shakes when accelerating

1997 Oldsmobile Cutlass Supreme mileage: 75,000. I recently changed spark plugs and wires on my car and now the car shakes slightly when accelerating. I changed each wire one at a time, so I'm sure I didn't cross a wire. It turns over and idles great. Poor acceleration and sputtering is my problem. I put the old wires back on, but no change. I also checked for something else I could have disconnected while working but I don't see anything. I have no clue what I did wrong.