Rough running with smoke ON

[Weary]

Hi All,
I'm a share-partner in a 1991 S-2B (AEIO-540) fitted with the optional smoke system.
I was wondering if anybody here has experienced has any rough-running issues when switching smoke ON ?
Another one of the owners tells me our machine suddenly dropped 300 rpm today (and frightened the hell out of him) the instant he hit the switch . All returned to normal as soon as the smoke switch was returned to OFF.
Any ideas ?

Thanks for any help,
Weary.

 

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