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ISV Cleaning...

I have twice had my 87 5000S quattro have problems cold starting. It 
starts up, then stumbles, then stalls. It usually takes a bit of throttle 
to get it going again after the stall. I thought that this might indicate 
a dirty ISV, does this sound reasonable? I was just going to take it off 
and clean it with carb cleaner, is there anything else I need to watch 
out for?