Q: Security light and engine light on car not start on 1st attempt

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12 equinox 2.4 turns over a little bit when no start intermittently occurs however 2nd try always works. replaced battery, p062f , p015a0 occurs intermittently sometimes after sitting overnight but also after a short drive and attempt to restart. Check engine light along with Security light comes on and goes off by itself without a discernable pattern. Replaced with new AZ gold battery but did not remedy problem as engine light reappears sporadically as well as no start. After a 2 sec break from initial start, the car has always started right up. Sometimes there is a feel that the engine is stumbling or about to cut off and give it a bit of gas to maintain idle on 2nd successful attempt to start engine. Also hear what can describe as light backfire noise in tailpipe occasionally. Tried Lucas fuel additive with no success as well. Chevy dealership said they replaced theft control module & key however car engine and security light came & no start right back on

My car has 124000 miles.
My car has an automatic transmission.

Broadly, you are describing at least three issues, which may all have discrete (separate) causes: 1) an electrical or ECM issue that is causing Code P062f to set; 2) difficulty starting, which may be an intermittent occurrence if I understand your question correctly; and 3) an engine performance issue, that is the stumbling on acceleration. These are all going to have to be addressed in turn because there may not be a "single", common cause, excepting the possibility that a faulty ECM accounts for both P062f and the engine performance issue. Your best entree to getting all this resolved is to begin with a hard start diagnostic. Once that issue is resolved, a real time scanner would be applied to look at engine operating parameters relevant to the stumbling issue. Finally, the electrical issue has to be resolved. On that, the FSM (Factory Service Manual) has a very specific protocol (a "decision tree") to work through a P062f code occurrence. The only way to resolve that Code is through that decision tree so your best bet is to just let a mechanic resolve it, unless you want to obtain the documentation and go through the lengthy decision tree. If you request the hard start diagnostic, the mechanic will commence the process of getting all these issues you are having with the car resolved. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.

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