Lately I have had a problem with slow starting with my 1996 C280. I changed plugs to the non-resistor along with igniton wires. It still takes fvie seconds or more before it will start. There is no problem with the electrical. It does trunover, just so difficult to catch. I am wondering if ignition coils could be the culprit?
Steve Dale

Maybe perform a leak-down test on the fuelrail.
If you don't have the required gauges & attachments, you will have to find somebody so equipped.

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2007 C 230 Sport.