'90 Olds 88 stalling on deceleration

Just purchased a 1990 88 with 68K miles for my daughter. Car ran well well for a couple weeks, now it stalls on deceleration (entering parking lot, slow corners, etc). Otherwise, no noticeable problem with engine - car starts right back up after the stall and it has thrown no diagnostic light. This has stalled around 4 times in the past 10 days, I have no service records on the vehicle. Also noticed the AC compressor short cycling but I don't see a connection. Any troubleshooting tips appreciated.