[dumb_ricer]

Alright, so my friend drives a 92 Laser AWD 5sp. Current mods are Ported 14b w/ 34mm flapper@14-15lbs of boost, k&n, open stock downpipe, and thats it i think. Well since he got it about a year ago it has had a odd sputtering problem from about 2k to 4k only when the motor is under load, the more load the worse it gets, almost feels like a misfire, but only when not under boost and on it a little. Another thing that *I* have not experienced after driving the car for about 2hrs over the past 2days, and not taking it easy on it either, is that it tends to die whenever he brakes he said. When I got in it tonight I pumped the brakes right when i got in and revs dropped to like 5-600 but they went right back up, so i dont think thats much of a problem. We have done plug wires, plugs twice, checked base timing, made sure everything was plugged in, and still it does that. Any other possibilities of what it could be? After it gets into a little boost it pulls like a DSM with his mods should pull. But even after each shift it tends to not want to go for a second then it puts you back in the seat again. No, I do not shift slowly, and it isnt the turbo as far as I can tell, as its happened with both of his turbos. Any more questions just ask me. Thanks for any help in advance!