2001 F150 2 wheel drive 4.2 auto trans it misfires at low rpm #3 and egr insufficant flow .codes 303,401this is what i done so far. replaced the coil pack one pack for all cyl. replaced spark plug wires. replaced spark plugs. compression check 155 psi. injector noid light shows pcm is sending a pulse. injector is clicking sounds like it works. changed injector with #2 still shows misfire #3. fuel press 30 psi unplug reg it jumps to 40 psi still misfires at 40 psi. anyone have a clue on this one i am stumped.
all most forgot i replaced the egr also.