Sounds like low fuel level in the carb. Maybe sucking air somewhere or the pump isn't putting out the volume it needs to fill the carb. I would get it running for a minute or so then check the fuel level in the carb or put a pressure gauge on it. Or just pull the line off, put it in a catch can and crank it to see how much volume is coming out.
"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 coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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