Unless the plug was properly grounded you would get a "wimpy" spark.
If you have a volt meter I would suggest checking the resistence of the suspect plug wire on cyinder #1. The resistence should be around 1K ohms. This can be a common cause of your problem.
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Scott Diener
89 300E
93 300E
92 Volvo 740 Wagon aka "Mutt mover"
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