Stalling hesitation issues

[William_Ray]

Hello all, first post but been browsing the forum for a while. Anyhow, I have been having issues lately with my 07 Escalade. It's been stalling at idle and usually wont fire up on first attempt. It usually need me to pump the throttle. When it does start, it throws the "service stabitrak" light and check engine light. Using the Torque app to pull the codes, its showing the P 0171 and P 0174 Power Train left and right bank too lean. I had the vehicle in the shop a month ago and the dealer replaced the fuel pump under warranty. It also had a new MAF sensor installed and new plugs. Still has the same issue. I was thinking possibly the throttle position sensor? Any thoughts or insight would be greatly appreciated.

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[Doubeleive]

go back to the dealer and have them do a fuel pressure test could be low fuel pressure

 

[Doubeleive]

could be a bad or dirty maf sensor too, try cleaning it with maf cleaner

 

[gpracer1]

Also check for vacuum leaks, brake booster hose, lines, intake from MAF to TB, etc.