Question about Chevrolet C1500

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I have a 1993 ss 454 it will start but wont stay idleing give it fuel it will start to idle up then choke out ive changed the fuel filter and the co2 sensor not sure of the problem

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I would change the MAP sensor and take the Idle Air Control Valve off and clean it with spray throttle body cleaner. Also clean out the port where the valve attaches to the intake. Don't use carb cleaner, it can harm the throttle body and related parts. You might want to purchase a scan tool to see if the on board diagnostics has any trouble codes which could indicate other problem areas, such as the catalytic converter. The tool is just a piece of metal designed to ground the a and b terminals of the diagnostic port. The codes are read by counting the flashing check engine light. Instructions will come with the tool. It's quite simple, but too much to try to explain here.

Posted on Mar 12, 2011

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Suburban 1993 2500 -454 / It runs rough on start up and then leans out and then the motor idles faster. It ran fine up until yesterday when my wife could not start it. Could it be a O2 sensor or fuel...

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Well - here is an old timers trick - you have nothing to lose so here it is.

Old school. To eliminate the possibility that you have trash in the carburetor :

Remove the air cleaner - start the vehicle and try to rev it up as best you can while you take a rag and SECURELY - try to 'choke out' the motor by shutting off the air. Do this while being careful and having a live GOOD Fire Extinguisher right there in a helpers hands. Try this about 5 times and - if there is any loose debris this method sometimes many times will clear it out.

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Wont stay running unless you give it gas

Clogged fuel filter.
Turn the truck all the way off.
Disconnect the two lines at the top and bottom of the fuel filter -fuel will start to run out of the upper line.
put in a new fuel filter being careful to get the flow direction correct.
crank the engine awhile until it starts.
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