first scan the computer for troublecodes. that should point you in the direction of what is wrong. when you replace what every part you need erase the computer. pull the ecm fuse for 10 to 30 secs to allow the computer start fresh. and drive it around so the computer can get used to your driving habit. plus check the obvious filter and oil condition, trans/t-case fluid condition. and see how she drives.

 

This is all I got:

32 - Exhaust Gas Recirculation (EGR) Circuit - EGR open command did not change the fuel mixture when the command was given during off idle operation. EGR opening should cause the mixture to be slightly richer because of the low oxygen content of exhaust gas.

This shouldnt cause #2 cylinder to misfire, though, Ive always thought the exhaust smelled rich.

So, does that trouble code mean that my EGR valve is shot?

 

It could be ether the solnoid is shot cuz it couldn't close it, or the valve is shot or the valve is caked with carbon

 

I had a similar problem. I posted a picture of what I found when I removed the upper intake plenum. it's in the following post:

http://www.s10forum.com/forum/showthread.php?t=226064

Mine's running great now.

 

WOW... that is.... wild...

Im going to pull my upper plenum off this weekend to take a look. Hell, Ive got to pull the plenum to replace my EGR valve anyway... Might as well test things while Im in there...

Another thing Ive noticed with my Blazer is the fact that after driving it awhile down the highway, it starts to smell like something is burning! Though, once I get it pulled over and start searching for the smell, its gone! And the smell is like nothing Ive ever smelled before... I have no idea what it could be.

Oh well. Like I said, Im going to pull that plenum this weekend. Ill post what I find...