I just got done with my b20 swap, and after about 15-20 minutes when I throttle it in about lets say 2nd or 3rd gear from like around 0k-2.5k it sputters. I tried advancing the timing, before it used to be around u 0k-4k. Now that I have advanced the timing all the way, it sputters around 2.5k and just straight up launches me. Anybody know what could be the problem ?