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Hey everybody I have a 2003 F250, 7.3L with around 225k on it.
It started having issues a few months back where it will start fine, run fine when cold, runs fine down the highway but once I pull up to a stoplight or pull in the driveway it dies. Then engine tone becomes muffled and if you keep the rpms up around 1000+ rpm it wont die, and when you start going the engine tone gets loud again. I just replaced the ICP sensor and it made things worse. now it doesn't want to idle and its harder to keep it running at stoplights. It started this shortly after I got it back from the shop where they put in new GPR and valve cover gaskets(to fix the cold start issue)