I would check the OVP Even when they test fine, sometimes they are not from what I have read on this site.

I'm not a tech, but I understand your frustrations.

I would check for spark, if you smell fuel, then fuel must be getting through.

You said you just had a Tuneup, so I take it they replaced plugs, cap, wires, and rotor? They changed the Fuel pumps and an o2 sensor.

So I think your only other thing to check would be the OVP or one of the other units you took out and cleaned.

Did you do one at a time? Or did you just unplug a bunch of them and clean them all at the same time? If you took a bunch out are you sure you put them back in correctly?

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon