E320/W210 engine shaking running rough

[johndd]

My 1997 E320 engine is starting to shake or shudder significantly at low speeds and the car is
running incredibly rough, since 3-4 days. The car has had a CEL "camshaft position sensor" error code
for over a month now, without any problem. The car has about 150000 miles. The spark plugs, spark plug wires have not been replaced in more than 50000 miles and no firing check/tune up for more than 25000 miles.

Funny thing is that my other car, (british car, 2000) also started shuddering at slow
speeds and at idle every 10 seconds or so, At idle the other car sunds like:

purrrrrrrrrrrrrrrrrrrrrrrrrrrrrGASPpurrrrrrrrrrrrr rrrrrrrrrrrrrrrrrrrrGASPpurrrrrrrrrrrrrrrrrrrrrrrr rrrrr

Both cars started seeing the problem at the same time. They were filled at the same gas station.
The weather turned from 90s to 50s at the same time. The E320 is definitely worse engine
shake and rough running.

Any thoughts? Thanks

 

[E270 Owner]

Did you just answer you own question ?

I would drain down the easier to do one of the two and re-fuel it
to see if it cures the problem or if its just a co-incidence.

 

[BAZZER1]

Once had a similar problem with my Volvo, it turned out that Tesco Fuel had apparently water in the Fuel Storage Tanks, a number of motorists engines suffered the same fate and I do believe that Tesco paid to have the cars which were affected by this repaired at their cost, so it could be similar contaminated fuel causing your problems.
BAZZER1

 

[m1br]

The car has had a CEL "camshaft position sensor" error code
for over a month now, without any problem.
Any thoughts?

Erm... cam position sensor gap to big?
Or the connector is full of oil now?