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I recently purchased a 2004 Chevy Colorado ZQ8. Overall, I like the truck, but since the weather started getting warmer, I have experienced a problem with starting it when it is over 70 degrees outside, particularly when it is sunny.

The problem:
When I turn the key to the start position, nothing happens. Then, after I release it, the engine turns over and starts. After a couple seconds, the engine stalls. After repeating this sequence a few times, the engine keeps running, but the security light on the dash stays on, indicating there is a problem with the theft-deterrent system or some related thing. If the temperature is cool outside, it starts up normally.

I have an appointment at a Chevy dealer to look at the problem, but being an intermittent problem, I don't have a whole lot of faith that they will find it and fix it. I was wondering if anyone else has had or heard of this problem, and if they might know what causes it. Computer malfunction? Intermittent sensor? Bad software?
 
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