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Truck running like crap! Help!

740 views 5 replies 3 participants last post by  Corey@CNCFAB 
#1 · (Edited)
I have a 1997 Ford F3 50 I change to injectors both valve cover harnesses ICP IPR CPS and all the glow plugs and controller. It has been idle hopping when you start hot and running like crap so I scanned it I got a circuit open high low code on cylinders three and four so I changed injectors first I also had a 3 inch downpipe and 5 inch exhaust put on. The idle is worse than it was before and every time I come to a stop it will idle down very low and Start chugging hard. I'm not sure if it's just more prominent because of the exhaust or not . But it does everything that it did before and it did not change a thing. Should I change the IDM? I am at a loss. Thank you
 
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