Cold idle is right at 2k rpm.

Cars are design to run at a higher idle at start up to warm them up quick. There is a sensor that reads water temperature and tells your car's computer how fast to idle. Your RPMs seem slightly high but not out of the norm. Does idle ever drop to around 600/800 after about a minute? If not, your engine temperature sensor maybe defective.

The throttle position sensor may be causing your issue----This sensor monitors the outside air temp.In the winter the throttle opens up far because th.e air temp is cold and vice versus

fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.

no year, wow.!
sounds like gross loss of engine power
or
you started car and didnt notice RPM was 400 rpm.
the engine has almost no power at that rpm.
the normal cold start (winter) is about 1500 RPM.
if not at fast idle fix bad fast idle (Bad IAC)

when i say bad IAC that means the system IAC is bad,not just a part.
the IAC /ISC controls idle at all times, via ECU commands.

coolant sensor indicate cold temp

Code 37 is torque converter clutch solenoid failure. Transmission wont shift in and out of overdrive.

Check your oil stick and make sure the oil is at the right level.

Check for vacuum leaks. Also try cleaning the ISV.


If that doesnt work go to vwvortex.com and post your issue there

Have the alternator tested. You are providing a low charge to the battery when you jump it and when taking it above 2K RPM requires more amperage resulting in the engine dying and the rough idle

Throttle body, IAC or EGR valve.