I have a 98 dodge ram 1500, 5.2 5 speed. When goin high in rpms at 3k exactly the truck missing and backfires really bad. But continues to keep goin up in speed and rpms, just misses bad. I cant figure it out. I have new map, tps,iac, cold air intake, headers, highflow cat and flowmaster, new o2 sensors, new plugs and wires, tb mod, 180 degree thermstat. All done about 4 months ago. Just started doing this last night. Any thoughts ?