The engine light is on referring to P0171. I was performing some tests and to check for fuel injector leakage and flow I need Rotunda Injector Tester #113-00001 and Rotunda Fuel Pump Check Valve-Pressure Regulator and Injector Leakage Tool #113-00010, SBDS or equivalent. Rotunda has discontinued these tools. Any ideas where to get them?

P0171 says your system is lean. Chances are you've got an intake leak somewhere around a gasket and its unmetered air is entering the engine. If you have a V6, the intake manifold gaskets really start to rot and from the heat.

I can confidently say your fuel injector is not bad. In the 10 years I've been apart of the forums on contour.org, I don't think I've ever seen a person have a bad fuel injector. They just don't go bad.