Quote:

My 94 ram with 268,000 miles started pop and backfire. about a year ago plugs, cap, wires, rotor, coil, fuel pump, were replaced.



if the sparkplug wires were replaced
and you didn't follow the directions and pictures in TSB 18-48-98
it is VERY easy to route wires to cylinders 6 and 8 wrong,
and this will cause the problems you describe

http://dodgeram.info/tsb/1998/18-48-98/18-48-98-v8.htm