Try moving the spark plug from the 'faulty' cylinder to another position, if the fault moves with it, then the spark plug is at fault.
If the fault stays on the same cylinder, check the coil pack, either by substitution, or by making a temporary connection to the suspect plug connection in order to see if there is a spark.
As you say that the problem is only at low engine speed, it might pay to check for vacuum leaks between the throttle body and inlet manifold, between inlet manifold and cylinder head and also on the vacuum pipe leading to the brake servo.
If the above does not reveal the the problem, then I would suggest that you carry out a compression test on all cylinders.
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