New cars produce little to no Carbon Monoxide. You would have to idle for hours and hours to build up enough to be deadly and not sure you could build up enough.
I used my old crew cab with a cammed 360 and slightly rich Holley. Idled it for four hours.
"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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