I have a 96 300E. When I start it when its cold out (below 80*) it runs VERY rough after the glow plugs cycle off and idles around 600prm. Has anyone heard of an aftermarket throttle control like I have in my 1980 W123? When depress the accelerator and bring the RPM's to around 1500 rpm she idle's smooth and when the engine warms up after about 3 mins, she's good to go. I'm just looking for some idea's for when I can't plug in the block heater like when I'm at work.

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2022 Nissan Frontier Pro4x
1990 Mercedes 420SEL
1950 Packard 8

Previous German cars-
2001 Mercedes SL500
1983 Mercedes 300SD
2011 BMW 328i (manual)
2008 BMW 535xi (manual)
2006 BMW M3 (manual)
1980 Mercedes 300TD
2006 BMW 750i
1996 Mercedes E300D
1994 BMW 740i
2006 BMW 330xi (manual)
1999 E300DT Smoke silver/black 253k
2012 BMW 535i Xdrive M-Sport
1984 300TD-T 304k
1988 Mercedes 560SEL (parts car)
2010 BMW 550i xdrive
2017 Audi A4 Presitge
1979 300SD 313k
2003 E500 189k