BAD IDM or something else?

[4x4ford4x4]

Just bought a 99 superduty 7.3 auto with 240k on it, Got it for a steal but I bought it running pretty rough, but was able to drive it home, (Codes said idm and SES light is on) it fells like it its running on 6 cylinders, when idles and driving rpm, but if i lay into it it starts to stop surging at high rpms, not sure what it is.(IDM, valve cover gaskets, Injectors or even something else) I had a obs 7.3 that i kept throwing money at and buying wasted parts i didnt need when i had problems, and i eventually went broke and sold it. Any suggestions on what it could be greatly appriciated

[NoRalPh]

What code do you get? Is it P1316 (if so, you need to delve in further and do a Buzz Test)...

Could be Many things, let the system help you out!

[4x4ford4x4]

thanks for your help i pulled the valve cover and inside was a broken connector clip , 2 zipties later, truck ran brand new again