Q: Will not stay running. Fault code P0172 on 2003 Dodge Ram 1500

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My dodge 2003 Ram 1500 5.7 HEMI will not stay ideling. When I push on the gas the engine will rev up and stay running, but surges up and down. It seems like a intake leak. But I cant seem to find one. The code that comes up is P0172 (bank 1 too lean). I have cleaned the throttle body and checked all the wiring connectors. No wires disconnected. I do not have a tester to run diagnostics. Has any one seen this same issue with their 5.7HEMI?
(3) Answers
P0172 is :system too rich (bank 1). This is usually caused by a restricted/clogged air intake filter. Manifold absolute pressure sensor, throttle position sensor, engine coolant temperature sensor, open thermostat, leaking fuel injectors, failing fuel pressure regulator, failing oxygen sensors.