And what do 5 spn 4.0 means
What you should be doing is taking it to a service center and having the fault codes read
wasting time here is wasting money as the truck is not earning anything
when you want answers from this site you have to include all the details like make ( freightliner) model ,engine make and model, gear box --auto, semi-auto or manual etc and exactly what you mean by not running right--missing, low power , black smoke
all of this information helps get a reasonable answer for you
not running right general checks
fuel delivery to engine / injectors /fuel filter
..not getting enough air
battery volts and amps and alternator checks
compression
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