I changed the o2 sensor upstream, and the spark plugs and wires. After that was done, i started it and it run really rough. I drove it down the road and it started shaking like crazy and smoking. I have no idea what i broke. This is why i never did car maintenance myself.

 

Is your firing order correct?

If you did plugs and wires, did you do 1 at a time so that nothing got mixed up?

 

Yeah check the firing order. I'm sure you bought pre-gapped spark plugs, but that's another possible issue.

This is the firing order for a 3800 if that's what you have.

http://ricksfreeautorepairadvice.com...2/12/3_8-K.jpg