Since my last post I took off TB, cleaned it, replaced the TB Gasket, cleaned the MAF Sensor. These didn't fix the misfire problem. I finally had a chance today to replace both spark plug wires I had gotten for free from MSD. They were the cylinder 4 & 6 wires, replaced them, took off all other wires and used dieletric grease on the coil & spark plug end of the wires. This fixed the misfiring issue. I'm very excited.