2000 GMC sierra 5.3 Bank 1 and 2 lean
I have a 2000 GMC Sierra 1500 with the 5.3L. Ive been fighting with the system going full lean. Both long term fuel trims climb to 25%. I have replaced the enitre fuel system, pump, filter, regulator, and injectors. Also replaced intake gaskets and checked for vaccum leaks. No such luck in finding anything. The cats have been removed and the downstream 02 sensors have been replaced with electronic simulators. Any help is greatly appreciated.
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