I'm new to Mercedes as I purchased '95 E320 with 150k miles on it a couple of months ago. Today, twice, the engine flared and joilted as the transmission caught. Both times it happened when I started to accelerate after slowing down to about 10mph. However, the problem was not consistent.

I was thinking that may be I have a sticky valve but that is just a guess. Any ideas are appreciated.

Thanks in advance.