If the battery has died or recently replaced the first thing to do is clean the throttle body. The PCM will lose it's memory and start over as if it's new so it expects to see a certain amount of air flow at idle. It the throttle body is dirty it doesn't have that. Plus cleaning the throttle body is free.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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