Are there any codes? Have the shop take a close look at the coolant temperature sensor reading. I've seen the wire insulation become brittle, break off and short together making the PCM think the engine is 40 degrees below zero. Causes an extremely rich condition.
"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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