Just happened to me!! - shop said i needed tune up,which i personally did last summer 4500 miles ago.i told them its not a tune up,more involved than replacing all the parts!!!i picked it up yesterday and after it warmed up,SAME PROBLEM!! took it back within 2 hours of picking it up!Well,they just called me,said they replaced fuel pump and its O.K. now.Now i have to discuss refund on tune-up with them.Oh,they also changed the oil which i do religiously every 3 months. The oil and filter only had 900 miles on them.WISH ME LUCK ON A REFUND!!
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A couple of possible problems, low compression on one or more cylinders, possibly a burned valve, possible headgasket leaks, have the compression tested and checked for a headgasket leak, both of these conditions would cause a rough idle and then seem to run normally when warmed up.
My suspicion is a starter going bad. Sometimes when starters get old and worn they will start good when the engine is cold but not when the engine is warmed up. Did you perhaps notice that lately is seemed to drag when you tried starting, especially warm or it seemed to crank a little slower? I'd replace the starter. Hope this helps.
CHECK THE FUSIBLE LINK THAT COMES OFF THE STARTER POST.THEY LOOK JUST LIKE A WIRE, BUT THEY GET STRECHY WHEN THERE'RE BLOWN.IF THIS IS THE CASE YOU WILL NEED TO FIND THE CIRCUT THAT CAUSED IT TO BLOW,AND REPLACE THE LINK.