2010 Ibiza mk4 diesel 6j

Jul 31, 2024
4
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Wondering if anyone can help in at my wits end.
Had my car just over a year, from the moment I bought it it’s had a really rough idle. It was a leaner car and now a first time driver car however my partner took it on the motorway. It judders violently but only doesn’t intermittently. I have changed my glow plugs, brand new injectors, new fuel filter, air filter. Serviced once ( only done 1k miles since I’ve had it)
Is it something to do with mapping/tuning
Is it trying to regen?
Is it just because it’s a diesel and it’s normal for its age?
really falling out of love for it and throwing money at it.
thanks