Last night about 90 miles South of Las Vegas, my 1989 300E suddenly stopped running. I was going about 75 mph and it was if someone turned the ignition off, no sounds, nothing. I coasted over to the side, called MB roadside assistance (works great btw). Checked under the hood couldn't see anything immediately out of place, oil good etc. Did notice that the exhaust was glowing red. Never looked at it hot and in the dark before so not sure if this is normal. After sitting and cooling for about 45 minutes, I tried starting, car turns over fine, but would not start. Tried again this morning before work, again will not start.

I had been having relatively long starts since I had the car (6 months), and gotten used to them. I have replaced plugs (non-resistor), plug wires that seemed to help some. Seems to start up quicker when cold, but not always. Also had slightly rough idle, which again seemed to get better with the new plug wires, but has since gotten to be about the same. Also, I had used the cruise on a previous trip and it worked great. Before the failure the cruise would disengage intermittently, eventually getting to the point that it would not work at all. Finally, the failure happened within 1/2 hour of topping off my gas tank.

Any help troubleshooting would be greatly appreciated.

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1989 300E
103,500 miles

1982 300SD
Sold but not forgotten