3.8L stumbling

Hello,

A friend of mine has a '99 V6 Camaro with 98000 miles. Lately it has been stumbling when he gets on the gas. I have personally not driven it but he revved it up and it just starts cutting out. He has recently relaced the fuel filter and he had the plugs changed a couple of months ago. I told him it might be the fuel pump but wasn't sure. What else could it be.

Thanks alot.

did he change the wires with the plugs?

I'm pretty sure he didn't

I had a 96 3.8 that did the same, changed plugs, wires, and o2 sensors and that fixed it.

its farely high milage too, could be a clogged cat.