got an 03 with afe air intake 4 inch mbrp exhaust fass 95 and an edge hot juice. My problem is it surges under a load or not. it will surge from 1700 down to 1600 and jump back and forth and wont go no farther. Its like hitting a wall it just wont go. I changed the fca didnt help any ideas. I also changed the fuel filter trying to fix this problem. I put a fass on it because I WAS told that the stock lp wouldnt keep up so please someone help.