Nellis

Hello This is my first post and I am looking for help. I own a 2006 mustang 4.0 V6 with 110xxx miles and I have this rather peculiar issue. When my engine is at operating temperature I have hesitation under acceleration and misfire when engine is under load. No check engine light. So first reaction is to change coil pack (never been changed) and was over due. Then the plug wires. No change then I cleaned the EGR valve. Nothing. No vac leak. Any ideas anyone. All Input is appreciated