Not even sure where to begin with this one. when i go out in the morning and jump in the blazer, if I don't let it warm up for 15 mins and try driving it it bucks and jerks and barely wants to drive. But once warmed up this completely goes away and won't do it the rest of the day until the next morning. Any ideas?

 

is it damp in the morning? The bucking only happen around 1-2 gear and 1500-2000 rpm? If so, I would lean on your ignition system having moisture in it.

 

Yes to it being damp in the morning, if there's moisture in the ignition system how do I fix this issue? Not that its a huge deal, like I said if I let it warm up it doesn't do it, but there are some mornings that I need to jump in it and go.....

 

Possibly bad spark plug wires. Look under the hood with the engine running when it is really dark outside and see if you see sparks coming from anywhere along the plug wires. You can also get a spray bottle with water in it. Spray the wires particularly at the distrivutor cap and at the spark plugs. If the engine starts to miss or dies the plug wires are bad.
If none of this works it might have moisture inside the distributor cap.

 

There are also little screens on top of the distributor itself that can clog and trap dampness in.

I had that very same problem, though I had to eventually replace the whole distributor as the bottom teeth had worn down. Another cause to your issue.

Also look for cracks in your ignition module where the short plug wire goes. You could have a crack and it not be a problem till it gets damp.

Another thing you can do is check the terminals under the distributor cap. Look at where they have been sparking. If its off to a corner real bad, you may have a timing issue or the distributor teeth may be eroded. Worth a look-see.