running rough

Any ideas? My engine suddenly started running as though it has a miss or skip in it, especially notice it when air conditioner is on or climbing a hill. I can notice it at idle too. Within past 3 months I have replaced plug wires, plugs, coil, fuel pump, fuel filter, oxygen sensors, air filter. Just tested fuel pressure and it is good. Compression on all cylinders is good too. Battery and voltage is good. No fault codes stored in memory. Dealer is my last resort and I am almost there. Thanks for any info.

Well, I found out the Bosch Platinum plugs I had were leaking where the ceramic goes into the metal part of the plug. Expensive JUNK. It was progressivley getting worse. Had the car taken to local shop. They said this is typical for these plugs and they never use them. Pulled them out and replaced them with plain old Champions. Runs great.