1999 Chevy Lumina coolant leak

This seems to be an intermittent problem. I out a new engine in 5 years ago. Last spring I put on a new head gasket, intake gasket and other things that were required at that time. 3 months ago I had a small leak that went away, until today. It seems to be coming from under the throttle body around the intake. The problem is that I let it sit for 2 hours then drove to the gas station and them right back home. It is not doing it anymore, but I smell antifreeze when I open the hood. I seen a little bit of smoke but nothing leaking. I am at my wits end with this. Any help woudl be appreciated. Thanks