Welcome to the forum. This is the place to be to keep your Blazer on the road.

A bit of advice: When posting share the year but also if it is a 2dr or 4dr and if it is 4wd or not. If it is 4wd tell us if it has 3-buttons to control the transfer case or 4-buttons.

Most importantly, using punctuation is super helpful for us reading your posts.

You smell gas when it is running and the spark plugs are covered with carbon? You also have trouble with it dying when at idle? I think a possible problem could be that the fuel injectors under the upper part of the intake manifold could be leaking fuel directly into the intake ports causing an overly rich condition. This could also explain the fuel smell from un-burnt fuel. Are you getting a "check engine" light? If so, go to an autoparts store and have them retrieve any codes and use them to help diagnose the issues. Be sure to share them here too. When my fuel injection "spider" was leaking one of the oxygen sensors reported a fault. I replaced it but the problem came back because it wasn't the O2 sensor failing but rather the source of the problem was the leaky fuel injectors.

Once you get things running, replacing the distributor cap and rotor will likely be a good thing to do but that is likely not the origin of the fuel smell. You could try replacing the cap and rotor now because it is so easy to do.

This time of year batteries on their last legs will falter. If it is 5 years old, it might be able to hold a charge or deliver much current anymore. An auto-parts store might be able to test it for you.

 

 

I agree with Christine, start by checking your fuel pressure. Rent a tester from a parts store, and read all the posts on here about how to check pressure.

Let us know what the results are, and we can go from there

 

 

Oh good. I'm glad to hear another opinion (and that my diagnosis is not out in left-field). I could easily see a leak from the fuel injectors causing a flooding condition that would prevent the truck from being able to be restarted right away.

 

"Check the fuel pressure" is pretty much the first thing anyone needs to do with any problem on these trucks lol! It's such a common failure point, and will dramatically help with troubleshooting.

"My brake lights don't work, and the rear end is grinding" "check the fuel pressure and report back to us"

 

I literally LOL'd! Yes, be sure to always check the fuel pressure, even before asking what color the truck is.