Car: 89 300se, 150k miles

Symptoms: cold start fine first time everytime - 750 RPM. then bogs down as I have to nurse it that first half mile. Once warmed up idles just at 500 and takes two cranks to restart. But usually runs okay with some struggle up hills with AC, others in the car. Uses little to no oil,

Well I have spent the last several months searching this site and others to understand how to locate the specific source of my problems but without success. Have taken it to two local indys to have them play with mixture with little difference.

What has been done: Bosch Plugs, new plug wires, new distributor, new rotor, new air cleaner, injectors were replaced by PO, vacuum lines checked/replaced as needed, idle control valve cleaned with new hose installed on top, OVP fuse fine. no error or warning lights display something is wrong.

Haven't spent much money at all on this car except maintenance, few fuses, relays, and an AC conversion and like many here I hope to keep it for a long time. I really like my MB. I have rebuilt engines on cars and motorcycles and am a fair home mechanic but not an electronic expert for sure. Also why I do like working on the car I do not want it to be the focus of my life right now with diagnosing this problem every weekend.

I am coming to the conclusion though that there are so many variables that might cause my problems that it could be any sensor or valve or switch that it might be easier to start testing/replacing everything suspect. Sort of an annual investment plan. Parts guys are going to love to see me coming!

Or I can just drive it like it is and put up with it's "character."

Sorry for the rant. Anyone have closer feel for what I should fix I might throw some more money at it.

Keep up the good work here. It has helped me a great deal.

Ranting in Austin,

tpynes

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1989 300SE 155k
1998 HD Road King/Iron Butt Member)
2006 Nike Air Max Moto