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Hey guys just joined! I have just got a 1989 jimmy 4.3 4x4 177,000 miles, when its cold it floods itself when you start it bad enough it wont run you hafta hold gas down for a couple minutes to clean it out. any ideas? would the temp sensor do this to it. No service light yet either but did pull codes out that were stored. Code 15-low temp -36*/ code 23-intake air temp sensor low temp/ code 24-vehicle speed sensor circuit/ code 34-MAP sensor signal low voltage. I bought this not running the fuel pump was bad changed it and it started right up,fresh tune up of everything. Any ideas as to which of these codes to start with would very helpfull.

Welcome to the forum.
I would start with the temp sensor.

It seems to me that I had a vehicle speed sensor code at one time and the sensor was fine.

After the Intake Air temp sensor if it starts find but has trouble idling I would then change the map sensor.