Try testing all the coil packs with an ohm meter to see if one is faulty.
Primary winding: disconnect each coil pack's connector and touch the multimeter's 2 terminals on the 2 pins of a coilpack, and make a note of the reading you get on the digital display. repeat for all 4 coils.
Secondary winding: remove the coil and measure resistance from the spring that the plug touches to one of the pins (try both, only 1 will give a reading)
A result of "0" or "err" or infinite or open circuit means the coil is faulty, if one is significantly different ot the others it means it is worn and should be replaced.
As a rough guide, the primary winding on a coil usually has a resistance of 2 ohms and the secondary winding on a coil usually has a resistance of 3-5k ohms (note the K)
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Volkswagen Golf IV - 98 1.6 Testing a.. new