Why is my Tahoe hesitating to start

No now it acts like I hesitant to start and is shaking and turns off

check engine light on?any vacuum leaks?have you tried cleaning the MAF sensor?check/change air filter.

Yes engine light is on and yes air filter was replaced and cleaned air flow

have the code/codes read at the ZONE,it's free,post codes here.

Codes are P171 and P174

codes PO171 and PO174 indicates both banks are running lean. the two most common problems for these codes are a weak fuel pump, or a intake gasket leaking vac. if the vehicle starts ok, then normally the fuel pump is ok. more than likely the intake gasket will need to be replaced. have the fuel pressure checked at the rail with a fuel pressure tester.pump may be weak..............................copy and paste link OBDII Code P0174 CHEVROLET - Fuel Trim System Lean … helpforcars.net/obd_codes/p0174_chevrolet.html

Thank u

your welcome.