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2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

2003 chevy tahoe z71 help!!

Old March 13th, 2019, 12:57 AM
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Join Date: Mar 2019
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Default 2003 chevy tahoe z71 help!!

I got this 2003 tahoe that i picked up at ranch that has been sitting parked hasnt been used since 2014 put new battery changed spark plugs, oil + filter, all 8 ignition coils cause it had a misfire when i got it.. new fuel filter air filter new throttle body... flushed the transmission out new filter gasket change A+B shift sylonoids ecs.. well that didnt work still acted the same which is itll start in 1st gear go to 2nd wont go back down unless i shift it manually wont go to 3rd gear nor 4th Ive already changed the transmission out the new one acts the same as the old wel i got the ECM PCM ECU reprogrammed from Flagship1 online sent them my VIN I installed it did the the pass lock key relearn got it started and it still running the same guys any ideas!!!? Please idk what to do?
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