'97 GC hesitation...

my '97 GC frequently has a brief hesitation after restarting a warm engine.
(I6.) When cold, I never notice a hesitation at all. I can drive until it
reaches operating temp. If I restart the engine before it completely cools
down, it will hesitate some on the first acceleration. It will occasionally
have a very mild backfire or 'pop' sound, then accelerate normally and run
fine the rest of the drive. This has never happened when cold. It starts
fine (within a couple turns of the engine..) Any ideas?

thanks,
cal