my 2000 f150 v6 started running bad so had codes checked and it sad egr flow insufficiant, and cylinder 3 misfire...so i replaced plugs and wires and egr valve. i cleared codes out, and it ran good for a few days, and then started running same way. had codes checked again, and sad cylinder 3,4,5 misfire. so i replace ignition coil pack. ran perfect for a few days, and now is doing it again. any ideas?

 

my 2000 f150 v6 started running bad so had codes checked and it sad egr flow insufficiant, and cylinder 3 misfire...so i replaced plugs and wires and egr valve. i cleared codes out, and it ran good for a few days, and then started running same way. had codes checked again, and sad cylinder 3,4,5 misfire. so i replace ignition coil pack. ran perfect for a few days, and now is doing it again. any ideas?

 

What are the new codes? Did you recheck the plugs to make sure they are gapped right? Did you do a compression test? Whats the fuel pressure running? What did the plugs look like when you pulled them?

 

check the vacume lines especially the ones on your p.c.v valve.