I'd suspect the stumble is related to an ignition misfire as indicated by a massive lean spike shown on the log as the large shift in Short term fuel...
I dont think cranking fuel has much input from MAF/Dyn, being that MAF reading is extremely inaccurate at cranking speeds.. InjPW is going down based...
Long story short. Have tunes from Patriot Diag. for the 6.4. Had an issue that caused me to have to return truck to stock file in order for dealer to...