Hello all. My 2004 Blazer has a problem with missing after it has ran for a spell.
When I first start it up it will run fine with no issues. If i turn it off and let it sit for 20 min or longer it will sputter and miss after I start it up. I sometime gets bad enough that it will make the check engine light come on or sometimes flash.

I just had the lower intake gaskets replaced and had the other gaskets checked and they all seem to be ok. It did this before and after I had the gaskets replaced.

I bought it used in February so i'm not sure about any service it has had in the past. It has 86,000 miles.

Thank You

 

seems like the problem i had on my 1992 Dodge pickup. i never fixed the problem, cause i spent too much tryin to figure out what was goin on. i replaced distributor cap and rotor, plugs, and that kinda stuff, throttle position sensor, etc. i never replaced the MAP sensor (Manifold Absolute Pressure), which was the last thing to replace. i didnt replace it cause it was $195 for a simple sensor. check you MAP sensor if you have one, your MAF (mass air flow) and ignition timin. hope this helps alittle!

 

id check for spark plug wires grounding out....look for water on the engine, sometimes a heater core hose will puncture and wont spit water till the engine is warm.