As it stands OTL, the beginning of the French and end of the American revolutions took place within the same decade, but OTOH the financial burden France bore from it's involvement played a considerable role in the French Revolution's outbreak. So any POD that delays the outbreak of the AR might also delay the FR, or butterfly it entirely.
Perhaps a more plausible scenario would be for the AR war to drag on through the 1780s without either side defeating the other decisively enough to end the war, although I've no idea whether this is plausible given the military realities and the mounting opposition to the war within the British parliament. It's also likely to majorly effect the FR(assuming that it isn't butterflied away)- for starters, French finances will likely be even worse then OTL's.
An added complicator is how this affects the unrest the Dutch underwent in 80s. Perhaps it would deter the Prussia's intervention on behalf of the Orangists?