Hi there! I have a rough start issue first thing in the morning with my newly acquired 03 Jetta with 192k miles. The car takes only a couple seconds of cranking to start but runs rough for about 10 seconds and then smooths out. This doesn't seem to make a difference whether it's 40F outside or 60F. I've eliminated the thermostatic tee, drilled out the check valves in the fuel sending unit, ran new fuel lines under the hood, new fuel filter, new updated MAF, ohm'd all glow plugs to be 1.9 ohms, tested glow plug harness, verified coolant temp reads the same as intake air temp and fuel temp. Timing is dead on, IQ is ~3.5 at hot idle. No engine codes in the VCDS. Not sure where else to look. Any help would be appreciated!