So I’ve got an S13 blacktop in my car and under full throttle it’s running like it has a boost leak. Sputtering and stops building boost. I’ve leak checked the whole car for any possible boost leaks and fixed any I found. Car starts, idles drives down the road fine just cruising but once I try to get into it it builds a little of boost and the sputters and stumbles all over the place. I’ve done plugs(gapped to .28) and coil packs as well as 255 fuel pump and new filter. Car runs a solid 10.0 on the wideband so it doesn’t seem to be any fuel issues.

Thanks for any help.

I would check your couplers for any tears and your IC coupler clamps to make sure you aren't getting any boost leaks under pressure (but sealed under normal op). I had a similar issue and it was a torn coupler.