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After leaving a stop light under hard acceleration my truck will fall on its face. I can let off the throttle and get back into it sometimes it will take sometimes it won't. I've replaced the throttle along with just recently the icp. I had to put in an idm back in December of '21. Not sure what next to play with.

2002 f350 7.3l stock down pipe to 4 inch duel stack to 7 inch tips added in February of '22. No other mods.

Thanks in advance
 

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How many miles do you have on the engine? Are you collecting and looking at data from the PCM? "I would recommend that you first invest in FORScan (forscan.org) and a suitable adapter. I have an OBDLink EX usb adapter (should you wish to use a computer to collect data), or take a look at either a BAFX or OBDLink unit. Both BAFX/OBDLink have a bluetooth/Wifi units (there are a few folks around here that recommend them) that will would work with a smart phone (Run of the mill box store scanners and even a great number of the higher end scanners can't touch these trucks as Ford used the "heavy duty diesel" protocol for communication). Once you are setup I would capture data.. At minimum I would save RPM (really this is CPS), ICP, IPR, MAP, EOT and IVS (at least I think that is the PID for the go petal). FORScan will allow you to save the data as a .csv file which you can import into excel. The information you get from the truck will help identify what your problem really is without just "throwing parts" at the truck."
In particular I'd watch the ICP and IPR graphs.

Cj
 

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2002 F450 SD 7.3L
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I had a similar issue. Was chasing a p1211 code and runability issues. Replaced the ICP because it was leaking. Didn't fix it. Then I did the fuel return spring/cap kit. Didn't work either. Did the CPS next which I did feel improved some things. But it was the IPR that did the trick. No more falling on it's face under hard acceleration. I also had to reseal my drain valve on the bowl to get fast cold starts from the bad seals losing pressure. Might look at that too.
 
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