Sounds like a plan - thanks for your help.

__________________
92 300E - 116K miles - Sold
77 Euro 350SL - 67k miles
94 Explorer 147k miles
2009 Hyundai Genesis - 65k miles

Glad to be able to help. It also cured the slightly rough idle it had, that would not go away after new wires, plugs, cap, rotor and CO adjustment.

I just remembered that I also replaced the plastic injector holder(s), I broke a couple changing the seals and decided to do all eight.

Good luck.

It's FIXED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

I went by a local MB independent shop and he told me that "sometimes" the o-rings on the pressure regulator on these older cars will leak just a bit and cause the car to exhibit my symptoms. I need to take a dozen donuts by next week.

Well, I pulled the regulator, went to Lowes and bought some "close to the same" o-rings, installed them, and now All is well. Now when I shut down the engine the pressure only drops to 3.2 and holds. So, for $1.27 cents I fixed the car. I was also able to reduce the idle mixture richness and hopefully I will see the effects on the injectors and plugs. I'm going to wait a few weeks before I buy new injectors and see how this baby runs with a bottle of injector cleaner in the gas and the reduced idle richness.

Thanks everyone!!!!, and I hope this thread helps someone else with their issues down the road. I learned a lot. I now know how a lot of things work (much more to learn), but this extremely frustrating episode has come to a close.

Dave

__________________
92 300E - 116K miles - Sold
77 Euro 350SL - 67k miles
94 Explorer 147k miles
2009 Hyundai Genesis - 65k miles

Nice wrench!

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe