So I want to get back to this as I resolved some things.
The "slow start" problem was due to an old/lazy starter motor. I've changed the unit with aftermarket Bosch and also replaced the battery and now car starts like a champ.
Rough idle problem went away when I added 2x 1liter (two separate times) of Antigrippante 25 additive in the tank when there was only 10liter of diesel in it. Inspecting the injector return pipe made me realized we have bad diesel in my country as there were a lot of rusty pieces in it - meaning there's water in it.
Last edited by urban60; May 26th, 2022 at 07:35.
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