380sel 82 160k miles

#1 may car shift fast and won't kickdown #2 hard start problem (if i start the car and shut off and try again immediately it will start no problem but if i wait it is one)
#3 the car run rough it is idle up and down #4 low oil pressure when idle it go up when i give it gas
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Look for vacuum leaks first. Then everything else :~)
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Hard starting when hot is probably caused by a leak from the high pressure side of the fuel system to the low. When pressure is lost in a hot engine, fuel vaporizes and you have to crank enough to get all the vapor out before you get to liquid fuel.
Places to look: fuel pump check valve, accumulator, warm-up compensator, fuel distributor presssure regulator, cold start injector, fuel injector, and a couple of other places in the system. There are rubber seals and diaphrams in most of these that get old and leak. The MB manual has a diagonstic routine for finding the problem, some requiring a fuel pressure guage. Of course, you have checked ignition and idle mix.
http://www.thetoolwarehouse.net has a fuel pressure guage # TA 33865 for $80.41 that fits Mercedes. (Seems high but has a variety of adaptors for metric and other vehicles - was $69.72 a year and a half ago.)
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