The car has become for the last month or so very hard to start.

Car: Audi, A6, 2001, 2.7L - Back to Fix-It - Audi Repair Manuals

Q.I have an Audi A6 2.7 with 115000 miles on the odometer. The car has become for the last month or so very hard to start. I replaced the ignition coils, fuel filter, and spark plugs but I continue to have the problem. Please advice.

I already checked/done: replaced fuel filter
replaced spark plugs
replaced ignition coils

More Info required Is the malfunction indicator light (MIL) illuminated?
Have the on board diagnostics (OBD II) been interrogated and diagnostic trouble code(s) (DTC) retrieved?
If so can you list them please?
When specifically does this condition occur?
Will it malfunction every time, hot or cold?
When it does not start, does it crank normally but not fire/catch at all, start and die immediately, start die immediately then crank and not fire/catch, difficult to start but does so and runs poorly for a bit then clears out?
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The car has become for the last month or so very hard to start.