I believe I'm having a misfire issue, but I'm not sure if it's the coil packs, wires, or injectors. The car wants to idle down when it's warm, to like 600 rpm when the idle is set at 860. It will almost stall out, then the ecm catches it and it idles back up to around 900. I bought an infrared thermometer, and cylinders 1, 2 and 7 aren't showing more than 280 degrees after the car warms up. The others are close to or past 400 degrees. Another strange thing i noticed is that if I rev the motor up, the A/F gauge shows 19-20 for a brief instant. The car is around 12.9-13.0 at WOT. I'm thinking about pulling the MSD coils and getting some truck coils. The plugs look good. Any suggestions?