Yes P0303 = #3 cylinder running lean but first here are the basic conditions:
This is a Surefire reman engine with new secondary ignition. The problem started with the installation of the motor. The mechanica called and explained the injectors needed replacing.
I took it home and replaced the old poppet valves with a set of the new Delphi injectors. Same problem P0303.
I thought I had screwed up the installation and got another set of injectors. Same result P0303.
I don't know GM products so I am lost as to where the problem could be, a broken wire between the computer and injector plug?
A bad computer? Are there any other components likely to cause this condition?
Thanks for reading this.