P0405 Ford - 2004 Expedition

Question

I changed spark plugs all coil packs and egr feedback pressure sensor and hoses but still have rough ride no pick up from red light and going up incline and jerking at high speeds. Now getting this P401 and P405 code I need help as to what is wrong now

Answer 1

P0405 EGR Sensor "A" circuit low

P0401 EGR flow insufficient

Rough idle, jerking at high speed. No pick up from a stop. This is a misfire condition. what is the year make and model. and what type of engine does this have? The 4.6 some of these are the 3 valve engine or the triton engine. and what were the sparkplug before the sparkplug change?

 Here was a mysterious misfire on a 4.6 Ford, the vehicle had a engine change. what was installed was a 4.6 triton engine. What the sticker on the engine required was sparkplug # AWS-32P, This what the owner installed, Not realizing this was a engine change over which had a 3 valve triton engine ,The sparkplug installed was according to the engine sticker. once installed  The vehicle would not acclerate, and  if it did it would misfire randomly, no power at accleration, also. but it idle great with no misifre. The fix was to remove the old sparkplug and install what was required for the engine that is installed.