W126

1986 300sdl Transmission problems

HI, Ive got a 1986 300sdl that I have fixed some vaccum lines on and changed transmission fluid in. Transmission shifts perfectly in all gears when cold but after driving awhile it gets stuck in either 2nd or 3rd gear. Most of the time shifting it back into N and back to drive will get it to upshift back to 4th. Would like to know what to look at and how to test. I have 5in vaccum at transmission at an idle. Any help Please and thanks.

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84 300SD rough idle

Engine idles with a miss that goes away at 1000 rpm. Pulls good from 1000rpm
Have replaced injectors, timing chain looks good. Pulling the fuel line from each injecter causes a diffinent miss. Fuel filters new. Ran good till 1 injecter frooze.

Found problem. I replced the rack adjustment bolt, reset according to the instructions you include with new bolt and vola, smoooth idle. Thanks again.

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