Ok guys this one has me stumped. Over the summer my 03 Aviator start throw codes for misfires (mostly random misfire). I have gone threw this issue with Ford COP I ordered 8 new Accel Coils. Issue was still present, codes P0300, P0316. The truck was low on power also, after weeks of data logging I discovered fuel pressure was low. I changed the fuel filter with no change. What I found strange is it wasn't throwing a code for low fuel pressure, hmmm. Fuel pressure was confirmed with a mechanical gauge. My mechanic thought it was the fuel pump, but I had my doubts since the fuel pump duty cycle was low and the pressure was also low. So I started to think a misreporting fuel pressure sensor (on the rail) was the culprit. The morning that I was ready to get the sensor changed the truck started running normal again, I changed the sensor anyway. Now 3-4 months later it's starting to do it again, although not as bad. Any ideas?