OK im stumped. Car is an 06 jetta brm dsg. 170,000 miles. I changed timing belt, cam, deleted egr,changed flywheel and mechatronic unit about 20-30,000 ago. It has been running great ever since. With the last cold snap, it was struggling to get up to temp, so i brought it in for a thermostat change. I drained the water from the lower hose, reinstalled the hose, removed the two oil dipstick bolts to allow it to swing out of the way, removed the alternator ground and power plug ( taped them up to be safe), and finally changed out the thermostat with the kit from idparts along with a new coolant sensor. Reinstalled everything , added coolant back in and started it up. I backed it outside to idle for a bit. I came out, got in the car and tried to rev it up and it starts running rough, smoking white, and wont allow me to rev past 1200 rpm. eventually it dies but it will start right back up and idle and then tarts the process over again. I have scanned with vcds and te only two codes i have are for the egr and intake flap which are removed. I pulled the intake and ran it with the open intake to rule out any suffocation issues. I also checked my torsion value and it sits at a steady .5 in all of the above conditions. What else am I missing??