Truck started rocking like a boat

[JLDickmon]

now..
7.3's are good for under valve cover gasket & harness problems..
pull the valve covers off and check and make sure clips aren't broken, wires aren't burnt up, etc.

driver side, you have to pop the crankcase vent & loosen the intercooler tube, you need some swivel sockets to get at a couple bolts..
pass. side, you need to take the oil fill neck out of the cover.. it takes a little finargling, but it does come out of there..

then wiggle the connections.. if it feels tight, it's tight. If it feels the least bit sloppy, you found a problem..

let us know what you find, we'll tell you what ya need to do..
this is cake.
Seems daunting, but it's cake.
(especially if you have heat & good lighting in the garage)

 

[JDW TRUCKING]

unfortunately, yes.

But.. don't guess.. diagnose. Involves a little of this -->
But saves you a whole lot of this -->
or this -->

and produces this -->
when you get it back up & running

could my injector still be bad if my idm is bad??

 

[JLDickmon]

could my injector still be bad if my idm is bad??

Yeah. It's possible.
Happened to my truck before..
IDM got full of water in a rainstorm and fried out..
put new IDM in it, threw codes for two injectors..
replaced injectors, no more problem for a while..

more likely it has a broken clip for an injector harness, or the IDM harness has rattled apart at one valve cover..

got the covers pulled yet?