Random Misfire NO DTC's

[SportTrac4oh]

Hi everyone, I got a pretty good one. I have a 2007 Ford Explorer Sport Trac with a 4.0L SOHC engine. There's a random misfire when the engine is at operating temperature and under heavy load (uphill) the misfires happen more frequently. No DTC's and I monitored key PIDS with my old (2008) OTC scanner. I threw a few parts at it to see if it would make a difference and I'm still stuck in the same boat. Parts replaced were Fuel Pump, Fuel Filter, Spark Plugs, Spark Plug Wires, Ignition Coil Pack, Fuel Injectors, MAF sensor, ESM/EGR, Throttle Body, PCV, and Intake Seals. Any ideas would be greatly appreciated.

 

[Rcflyer330]

well you are left with only a few things. check for any cracked insulation mainly around the fuel injectors. how's the compression? lastly could be a faulty pcm. what pids where you monitoring?