99 intrepid

I 99 intrepid with a 2.7 liter engine the car runs fine when it is cold as soon as it gets to running temperature it will start to miss, especially when it is in gear. as soon as it get to 1500 rpms it runs fine. every once in a while it will surge going up the ladder of the rpms. I have change the sparkplugs gapped them right ran good for a day, change the coil packs ran good for a day, changed the battery ran good for a day. has no check engine light code reading. has no vaccum leaks and compression is fine check by shop.stumped everything I change seems to run good for day. any more knowledge on this matter would be much appreciated

have the guys at the shop test the igniton coils. If that's ok, it might be an internal fault in the PCM.