Choking out warming up

2002 CHEVROLET BLAZER
138,000 MILES • 4.3L • 6 CYL • RWD • AUTOMATIC
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MAC LOUGHER
  • MEMBER
  • 1 POST
Every time I start it in the morning, it takes a while to actually start, and then it starts to choke itself out. It will idle high like around 1000 rpm's and it will be erratic, which also follows the engine temperature gauge. So when the temperature gauge drops the idle is funky. But when the engine warms up about a third of the way, almost half, it will run smooth, idle at 500 rpm's and if I cut it off, it will start up fine as long as it is already at least a third warmed up. I have been told idle air control sensor, temperature sensor, throttle position sensor, and a bad ground somewhere. Has anyone experienced this problem? What could be causing all that?
Jul 27, 2016 at 6:51 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
scan for codes and check fuel pressure with a gauge first. auto parts rents gauge and scans for free.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Jul 27, 2016 at 7:08 AM
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RENEE L
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 1,260 POSTS
Hi Mac,

If you decide you would like to conduct the scan yourself here is a link to an article that features written step by step instructions and pictures explaining how to do the scan yourself, also I have included a link to our YouTube channel with a how to video on code scanning. Most scanners are inexpensive to purchase, you can purchase one online from sites like Amazon.com

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://youtu.be/YV3TRZwer8k

Once you have the codes please get back to us so that we can further assist you. We are always happy to help.

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
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Jul 27, 2016 at 2:21 PM