I'd check if possible. If you dont see anything then take the pigbuggy in and get raped by the dealer to find out what it is.;)
Erg80
p.s. Great color and year.
I think concretejungle might be right. When I got mine it had the same symptoms. They had washed it the night before and It was water in the spark plugs. I got a new set of spark plugs out of the deal. :)
ERG80