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thanks for replys. had codes for all sensors being out of range or low output, so many codes can't remember them all.has new battery, dist. cap and rotor, wires, coil, plugs, oil and filter, pulled tb off and cleaned, checked fuel presure and injectors for leaking. runs perfect first time...

hi all, newby here. i'm trying to help my son with his 99 tahoe 4wd. the truck sat for about 6 months, ran ok before this. however now when you start it the first time of the day it rans and drives perfect for however long its running, could be 5 mins. or 2 hrs. runs great! but if it is shut off...