crazy studdering while Reving

[Pimpin Dsmstyle]

My buddy just went to do a stupid tune up on the car. Replaced filters, changed oil, did some free mods.. everything was working fine. A couple days later, he decided to swap plugs and wires because he broke a wire doing a comp test and the plugs looked like they were the stock plugs.

It was running fine for about 10 minutes of driving. Shut it off, came back about 10 minutes later, and bam. At idle it sounds just like a beat.. you could here like a heart beat of exhaust. It was anything but a constant exhaust sound. Then we started moving and noticed it was studdering really bad. It is slower than an N/A dsm I'd think. I really dont know what happened.

He used the correct plugs ( bpr6es or some shit) and some cheap ass wires. Xact or something shitty along those lines. This car is completely stock ( 1g tsi AWD 7 bolt 92)

Any ideas anyone? Its friday, I probably wont get much help heh.