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Has to be bad plug/wire/contact.
Use a logical process of elimination to determine which of these is guilty!
Disconnect plug leads in turn to locate problem cylinder, then replace that plug first (most likely problem if your leads were OK before plug change). If not this, try dielectic grease to promote contact and check fit. If all else fails you may have to consider the lead.
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Jon Taylor
MY89 Carrera Targa Sport
MY93 3.0-24V Vauxhall Carlton Diamond
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