hello all,

I've got a 1988 300SEL that has been very well maintained despite the 260k miles on the clock. Ran well, until recently. Now it won't start, and once it does come to life it will drive very roughly for five feet before shutting off again. So far, I've replaced:

air filter
spark plugs
plug wires
cap
rotor
fuel filter (next to fuel tank)
ignition coil

Any ideas on the next route I should take? I've owned diesels for many years now, this is my first gasser benz.

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1980 240D, 197580 miles - "The Stuttgart Stomper"