I have had problems keeping my Cadillac Escalade idol from dropping from 7.52 5.5 and lower it doesn’t happen all the time and when it does, it causes my car to shut off it causes my trash in control light come on and also my engine light. I have changed many things already as an airflow sensor throttlebody map sensor timing chain both sensors for that spark plugs please let me know what you think. Thank you.

Alternator burn out and battery cells gave way…in a trip up north…drove back home…noticing lack of power…replaced both things…including spark plugs and wiring…and ignition coils...oxygen sensors…both MAF and MAP sensors…throttle body…ground cable…fuel pump control module…fuel injectors…ECM…knock sensor and crank sensor…what’s left is starter and fuel pump

My 1999 Cadillac Escalade has a new fuel pump a new fuel relay a new bank one sensor one heater circuit sensor O2 sensor. It has a battery group 78 with 600 code cranks why won't my fuel pump kick on and I also added all new ground wires three in the back by the fuel tank and I replace four under the hood brand new car cranks over but won't start

When filling up, not enough fuel reaches the tank due to air leakage. How do I fix this problem? Are the oxygen sensor and fuel pump related to this problem?