Truck also idles a bit rough... don't know if this helps or not.. and one other thing I'll throw at y'all last week I was messing around and noticed the hose comming off my smog pump was leaking so I replaced it in hopes that was my problem but it only seemed to make the miss worse... could it be the truck is getting more air than fuel?

 

Well when the air pump and ear works right the egts in the cats will increase,so if their plugged off it will be worse,it might be loud as hell but disconnect the y pipe from the manifolds and see if it idles better and the miss goes away,or a exhaust shop can test or check them too,u can have some one area the motor and u can feel at the exhaust tip for amount of flow and to listen for rattles and feel the cats for vibration,

 

Some back pressure is good,but too much is not,also make sure our spark plug wires are not wrapped around each other or touching in necessarily, this will cause a miss fire and could compound or issues

 

Ok i'll check it out... and my plug wires are routed exactly to the diagram haha took an hour and made ti perfect

 

And I have pulled the o2 sensor out and seen how it runs... and there is no change still a freaking stumble

 

Have u tried replacing the ecm,(computer)they do fail,their not much from a wrecking yard ,have u taken in in to a ford dealership,they can hook a computer up that will monitor every thing in real time as it happens...I would try that,I have no more ideas of what could be causing this.....its probably something dumb too

 

^ I second this. Were still shooting blind. It might be time to take it to a good shop that can run all the diagnostic tests I mentioned. All those readings need to be put together to make an accurate picture of what is wrong.

 

Ok so only code I'm getting is 225 stinking knock sensor... I have replaced it with no prevail. How can I go about testing the wiring for it and all?

 

Anyone got anything ? I looked in my Haynes for the wiring diagram and it seems pretty complex just wondering if there was a simple test for this

 

Hey biggreen. We just had the motor rebuilt, added headers. Couldn't run the exhaust back to the bottom of EGR without cutting into the headers! Just hooked everything back up. This truck is 1993 F150 4x4 with 351 cu. windsor. Couldn't figure out the miss, stumble from idle to just open throttle. It would stumble or die! Changer everything possible! Took it to auto shop MiraCosta College. Just about gave up! They disconnected the wire @ EGR connection. This fixed it, runs great! no more stumble or die. It will still through check engine code. but runs fine. Or I have to cut into the headers, no way!