Keep the OPS plugged in,the issue involved there is for 95 and older having a bad OPS and no lift pump operation.

Plugged the ops back on took it to town and I starter to notice that if I slow down to 50-55 and then loor it when I get to 63-64 mph it coughs quick and the keeps on accelerating. I can het this to repeat almost everytime

The turbo lays down around 2400 rpm on these trucks-might be that or it is running out of fuel.

On wide open throttle the LP drops to near 0 fuel pressure and if the filter is dirty it could be some starvation?

there isnt a lot of miles since I changed lift pump (heath diesel) and put a new filter in. This was done last summer, but I dont drive the truck much

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That also seems to be around the same speed that it will stall at when I am driving normal. Sometimes it will start right back up other times I will have to switch pmds and then it starts

On mine it ended up being a poor connection on the truck side of the pmd harness.

Experiencing similiar symptoms
 

Have 97 6.5 To date have replaced LP, IP, OP, PMD relocation, all new fuel lines to sending unit in tank, fuel filter housing. This thing will run fine just like you explained then out of nowhere starts kicking bucking stall once in a while hard to restart. Have checked grounds and one thing notable as well when it gets below half tank it does it acts up more, or so it seems. Have to get use of a scan tool. Its had EGR code but that's it have not run diagnosis for a while. I am sympathetic and have spent crap load of $$$ Very puzzled. Motor only 114,000 mi. so if anyone out there has ideas let me know.Thanks guys and gals

Try running with the fuel cap loose.

If the vent in the cap is pluged or a gasser cap was installed by mistake it will cause similar symptoms.

I'm having same problems let mW know when u get it figured out