Sounds like it has a miss.
Check to make sure you didn't cross the new spark plug wires and have a couple going to the wrong cylinders. That would account for the "put, put" sound and the loss of power. Also, make sure the wires are making good connection at the spark plug and distributor. Make sure you feel a "snap" when they plug in. If not, push the boot up the wire a little and then retry. (the boot will be hard to move but it will go).
If that doesn't work, check your spark plugs. Take each one out and look at it. If it is covered in black soot or is wet, it means that cylinder is not firing. You either have a bad wire or a bad plug. (assuming something else didn't go bad). I make that assumption since you didn't say if you touched anything else.