Not enough information to do any debugging, buddy.

I'd pop the hood and check the usual things... oil level, oil quality, pull the oil filter, check for bits. Look for things that are loose. Pop the valve cover, check what you see. You can do all these things without starting the engine.

Good luck!

Packman

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83 240D - 4 speed manual - Manilla Beige
189K miles, Tachometer mod, cool wooden shift knob from PeachParts, CocoMats, Original factory paint, manual windows, manual sunroof. Starting to add AudioWrap to this car too!