Spark Plug Riddle 1991 300SL

[sldan]

I am looking for an explanation for why just replacing the spark plugs in my 1991 300SL 65k miles would correct an engine stumble at throttle tip in from a stop. This imtermittent stumble would only happen until the engine reached normal operatin temp.

The plugs that were removed after 10k miles look clean and to be the proper heat range. Every time this problem has occurred it was fixed by either replacing a cracked dist cap or changing plugs.

sldan