So my TD has always ran very well. About three weeks ago the exhaust fell off and it's been sitting, I have driven it once since. Today I needed to drive the TD because a drunk hit my 400e while parked in front of my house.

Start up was fine, low idle/small throttle input through the neighborhood(it's very loud) was fine. Once I got out on main road's it was fine. I came to a stop light and noticed a rough idle. By the time I got to my destination, about 5 miles later, I was having to shift to neutral and hold about 1500 rpm at the lights.

Once I got done with work, about 6 hours later, my TD would not start. I got it to start with heavy cranking and fast pumping of the throttle. Blue smoke was belching out of the remaining exhaust. Glow function seemed to work fine. Once started I had to hold 3000 rpm until it sorta smoothed out and would stay running. The entire 6ish mile trip home I had to keep the rpm above 2500-3000 and shift to neutral at lights with 1500 rpm.

Once home I swapped the primary filter with no difference. Went to the store(took the 300d) to get a secondary and have not been able to get it to start since. I pulled the air filter off, no difference. Everything looks normal under the hood. Last time I checked(about 1.5 years ago) the timing stretch was 1.5*. Turbo is spinning freely. Once it was running it smoothed out above 3000 rpm. No noticeable smoke once running.

Seems like it "jumped time", but I dont know how. Again, my TD always ran very very well.

Any ideas?

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D