Try cleaning or replacing the idle air control valve. The IACV is the only device that controls idle on this engine via input from the vehicles computer. Check for any vacuum leaks by spraying carb spray around the intake manifold and any vacuum hoses while listening for any change in engine rpm. If rpms change; you have a vacuum leak- fix leak first. If check engine light is on; you need to have vehicle scaned to extract the trouble code.
I had an 04 blazer. There is an undocumented problem with leaks in the intake manifold. The original gasked was low quality. I would expect that you have a vacuum leak in the intake manafold. My problem was a coolant leak. Replacing the manifold gasked fixed it.
If not this, make sure you do not have any creaks or opening in the air hoses that fed the throttle body.
SOURCE: I Have a 2002 blazer that starts but motor dies, surges when accelerating
If this engine is a VORTEC then you may have a problem with the internal fuel system. Under the top plenum there is a fuel reg and poppet valves that inject fuel into the cylinders. Sometimes the tubes that run fuel from the reg to the valves can leak and cause your problem. This cannot be found with pressure check because this occurrs after the reg. PS fuel mileage will go down. Let me know if this helps.Moe
SOURCE: 89 chevy s10 blazer puff smoke out tailpipe when 1st started
the puff of smoke is one of 2 things, dampness in the exhuast from setting over night,like ice water on a hot day ,the glass draws miosture,this is harmless, the other is worn valve seals,a puff of gray blue smoke then it,s gone,harmless.,but if it smokes while your driving it after 2 minits you may need new positive check valve $5 part,if it uses excessive oil have it checked
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