Ok, i could use some help, my 6.5 has been nothing but trouble but now its barely drivable due to the rough ride and large amounts of white smoke and now oil is coming out of the exhaust flanges off the headers on both sides. Im no diesel mechanic so any help would be much appreciated

 

Sounds like you have a exhaust leak therefore losing boost get the exhaust fixed these have to have a well sealed exhaust system to make boost to burn all that fuel that's the white smoke you are seeing white smoke=unburnt fuel.

And unless someone rigged up headers them are exhaust manifolds.

 

I found the oil problem, it was just leaking from the valve covers but what could be causing the bad miss and smoke? I put new glow plugs in, but when i did i found one that was never even plugged in. I plugged it in after new plug just to be safe but it didnt change anything and when it gets up to temp the oil pressure bottoms out at idle along with voltage