Hey guys, last week I fitted a rapidsstems v3 kit, walbro pump, valve springs, siemens 60lb injectors, car already had full 3.5inch exhaust, had it tuned, it made 326rwkw and ran awsome for a couple days. But I've noticed it's lost a sh*tload of power. I've searched the forums and saw ppl who have had similar problems but with a few differences. My car still boosts to 15psi but as it comes on boost the car shudders, and pulls no where near as much as it did. My traction control light flashes while this happens? I dunno if that has anything to do with it but even with traction control off the shudder still happens. I know it could be plugs, or coils, but I'm just wondering if there's any other ideas on wat it could be before I take it back to the workshop. Any help appreciated. Cheers