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When running with the sensor plugged in, tap on it moderately hard to see if it has an effect on the idle. That's what we used to do many years ago. Have you watched the MAF reading at warm idle? Usually in the middle single digits, like 4-6gr/sec and relatively steady. I know you mentioned a new TPS. What is the idle voltage? I saw mention of the EGR clicking too. The EGR should not be active at idle, no clicking to be heard.

How much fluid drop from start to finish? I have a Hydac also and I found 9/16" to 5/8" is in the normal range. I have not checked estimated gas pressure lately. I will say, I have never been able to achieve the number pf pumps some others have. I see 2-3 with mine right now. I think you are doing the right thing and monitoring the situation. I found that my brakes felt firmer after replacing the original front brake hoses a couple years ago which also seemed to reduce pedal travel required. Related?? Maybe.

I started a new topic about my Mercedes adventures called: "Ronnie's New Toy (Mercedes)".

Thanks Ship. It's cleaning up pretty good. Paint is good but needs buffing and waxing. Interior looks practically new other than the headliner. I drained the gas tank yesterday. I have a new fuel filter that I will be installing today. After adding fresh gas, and a bottle of Heet in case there is still some water in the tan, it will be ready for another test drive to see how it runs. I found a Youtube video that shows how to take the headliner out. I'm going to follow Dave's advice on getting an upholstery shop to cover it. I'm not quite ready to do it yet. As a temporary measure I might try some of these buttons to hold it up until I get it done properly. I won't be putting them as close together as the photo shows. I think just a few will hold what is loose right now.

There is. It's in the "How to" guides. Look at "Electrical Systems" and then "Computers and Sensors". The latest version is ANCX others that would work are ANBM or AJSF. I just checked my inventory. I do not have one. There are a number of Rivs and Reattas at Gibson's. Maybe there is one there.

Finally got the Mercedes home. It's like having a new toy to play with. The security system was what was keeping the fuel pump from running. Once I figured out how to deactivate the security system the fuel pump started running and the engine started. First step will be giving it a bath. Then I need to drain out the old gas and change the fuel filter. I got about 1/2 cup sample of gas out of the Schrader valve and it had a lot of water in it. I'm surprised it ran well enough to drive it home with that much water in the gas.