1980.
Sixto Lezcano wins it with a grand slam in the bottom of the ninth.
I was in middle school but remember listening to Uecker make the call.
Overall 1980 was a slight disappointment. Coming of 93 & 95 win seasons in '78 & '79, expectations were high but they finished with 86 wins (17 GB in the pre-Wild Card era). That disappointment led to Dalton making a big splash in the offseason bringing in Fingers, Vuke and Simmons, which led to the playoffs in '81 & '82.