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make, model, year? backfires are spontaneous burning (exploding) of unburnt fuel outside of the combustion chamber. suspect bad spark plug/s, ignition coils, ignition timing, computer, leaking fuel injector, etc. scan for trouble codes, then post back. because the problem is intermittent, problem manifests only when hot (engine at operating temperature) do tests for both cold & hot conditions. test resistances (ohm) of suspected sensors: cam & crankshaft position sensors, ignition coils (if possible),(search the web for the recommended procedures). also test voltages at the computer (search the web for the pin outs of the computer of your car). also check associated relays (like for the fuel pump, etc.) a bad relay may have its coil open when heated, then becomes good again when cold. i suspect the car may have a good fuel delivery but the sparks are not coming in on demand, thus backfiring.
have you had the fuel system cleaned as it could be dirt.also have you cleaned the throttle valve(plate)as when these get dirty it can cause this type of condition.it could also be a fuel supply problem like fuel filter,fuel pump,injectors.the ignition circuit could have a problem also like the coils,the ignition module,you don`t say if you replaced the plugs when changing the wires.it could also be the crank sensor or cam sensor possibility.this should be checked out at a shop if you can as some of these things need experience and equipment to diagnose.
Sounds like a plugged fuel filter. You might have dislogged some "crud" when removing the lines, etc... Can't be 100% sure without doing a test on the fuel system.
Good Luck.
sounds like you may have a fuel delivery problem,There is a fuel regulator that keeps a steady pressure this may have the same tendencies as a fuel pump cavatating also,Have a good garage do a fuel flow test as well as a fuel pump pressure test.
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