2001 Blazer 4.3 Vortec 2 door
OK, I am going out to my car to take some pictures of the plugs and show you what they look like and see if you can help me.

Car was running great all day, I parked and went inside work at like 12 and left work at 5 to go home and it started but was jumpy and check engine light was blinking.

I got home, looked under hood at night for arc-ing... none, so next day I used a spark tester on wires to ground, and I got a spark on all wires at correct gap. so I pulled plugs to take a look at them and cylinder 4 and 3 were the odd *****. I will post the pics in a sec.
Attachment 3445


So my question is: What do you think my next step would be?

 

Ok well the pictres aren't working so I'll describe.

Spark plugs were all pretty black on the electrode and ground point, with strong smell of fuel. Except for cylinder 4 and 3, they were kind of white and no fuel and look like they burned only on one side.

 

I've had this problem before. Have you used any oil or fuel additives? As for the other plugs, same thing happened to my boyfriend's truck and he needed a new spider injector. I'm not saying that's what it is, it could be a number of things. But if they smell that strongly of fuel, you most likely have a leak somewhere...