I have a 92 190E2.6 (103 motor). I looked at my car and the base of the throttle had two vacume ports. The top port was factory rubber plug and the other had a black vacume line with white stripe going to what looks like a checkvalve next to the ABS unit. It then became a clear vacume line with red/black srtipe going to a solonoid on driver side strut tower next to the EZL ignition module. It then leaves as a clear vacume line with a black stripe to a rubber "T" on the first intake runner. I then goes toward the distributor cap area where it travels inside the ignition wire loom on the valve cover top and goes to the two solonoids on the firewall near the battery. These solonoids go to the EGR valve and the air pump.