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what could the problem be?
Could be time for a tune up.
Usually a sputtering muffler means that a new catalytic converter is needed. The sputtering sound is the car misfiring.
You go to a mechanic!
If a car is sputtering at high RPMs, the fuel pressure needs to be checked. If the fuel pump can't keep up, this will cause sputtering. Also, the car should be checked to make sure the valves are adjusted properly.
It needs a tune up.
Was it missing and sputtering before you changed them? If no, then you could have got the firing order mixed on the distributor. Maybe if you didn't replace the wires also one became more damaged while removing it. If yes, maybe its your fuel, or injectors, and you need to add a bottle of cleaner to your gas tank.
It could be the firing order is wrong
Timing issue, poor ignition.
If your 1994 Honda Civic is sputtering, it may be due to a clogged fuel line. Another possible cause is that one of the pistons isn't firing correctly. A tune up might be in order.
I sometimes sputter when I'm nervous. Please reword the question and tell me what year and engine and describe what you are doing with the car when "sputtering" occurs. Would help if you can think of additional description of what you mean by "sputtering".
ggd