Acceleration lag
 

Hey guys, 2012 Clubby here. Bought last summer with a blown head gasket. Spent the winter tearing it down and replacing gasket and thermostat housing.
Fast forward to now, she's registered and back on the road. During the first 100 miles I've noticed that the car has a 2-3 second acceleration lag (not always) from a dead stop. She runs great and accelerates great other than that. She's an automatic, and A.C. is usually on as I'm in California where it takes. I'll try it tonight with no A.C. on and see if there's a difference.
Anyone else experience this?
Any suggestions as to a fix?