For everyone who's having starting or idle issues with 93 -95 W124 3.2 or 2.8 liter. Here's how you get your car to idle or start correctly. These problems are mostly related to old parts on old cars.

You only have fuel and spark in this equation. You have to write down all the parts for fuel and all the parts for spark.

If you have not replace the upper wiring harness in your car, or don't know the condition of it, stop right there. Do this first. Just moving one these old wires can cause your car not to start.

If your harness is good, pull the codes from your computer and clear them. Drive around and see which codes come back. This is a good starting point of what to replace first.

Next make sure all the components on the fuel side are good. Fuel pump, relay, regulator etc. If this all checks out you can move on to the spark side.

On the spark side you some of the main parts are MAF sensor, Temp sensor, Crank position sensor, coils, trottle body, fuel injectors, spark plugs, control unit, etc.

Start replacing the cheapest parts first until your problem goes away. If you have a good mechanic who works on European cars , he has the tools to test most parts, and will save you time and money in the long run.