In the 405 the 1.9 had a completely mechanical pump and adjustments could be made although they were rarely if ever needed it, your's I believe has electronic management in which case there are no adjustments and you will need to get the fault codes read in order to find the problem.
If by any chance yours does have a mechanical pump it will have a throttle cable connected to it and probably an adjustment on the throttle lever, I suspect though the fact that it needs adjusting indicates that it doesn't.
If you can't get it sorted, try the French Car forum. http://www.frenchcarforum.co.uk/forum/viewforum.php?f=4
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