Weird, my car just started doing this. I have a leak either at the manifold or the downpipe. I was able to trace it by starting the car cold then pulling on the throttle linkage a bit while it was still running rough so it would smoke. Sure enough, I got smoke coming from near the firewall on the pax side. It's either at the manifold or the downpipe (probably where the flex pipe is). It isn't hard to troubleshoot. Good luck.

BTW, if it's the manifold gasket leaking, the repair sucks. It's terrible. Not looking forward to it.

__________________
-----------------
1984 300D 193.5k miles
ASTM-certified B100 bio when able