After I got my lower intake ported, I started hearing a lot more cracklin from my exhaust. Like back pressure popping. Not backfiring. Is this normal? Another thing is that while in 2nd gear and driving steadily at 3k rpm, my car misses and kind of bogs a bit. Any idea why? It still tears the tires up if I floor it tho. My f/p is at 40psi and my timing is set @ 15* with 93 octane.