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New injectors? Worth it?



I've been having a weird missfire on the Clio for a while now - holding the throttle at a steady 50/60 it sort of "coughs" every so often like it's missing

Now when I fitted the ITB's I fitted them with the fuel rail and injectors from the 182 as it was lower mileage - but one of the injectors failed completely in winter (tried different injector plugs to be sure it wasn't loom related) and the weird thing was it was a nearly new injector. Bizarre
So I swapped back to my 120k 172 injectors and they worked ok for a few months but now have this miss fire

Last night I fitted my 120mm trumpets and swapped back to the 182 injectors but binned the new faulty one and used one of the 172 injectors that looked clean and healthy - seems loads smoother now and I'm getting 38mpg on a casual drive out LOL!!!

But what I want to know is - you can buy brand new injectors for about £120 a set on ebay. I'm planning on swapping the fuel hose for braided and the rail for a solid jenvey item next month. Is it worth buying a brand new set of 4 injectors or shall I just take the 7 I've got to be cleaned/tested and pick the 4 with the best flow readings?

I was going to buy brand new but this new one that's failed has made me wonder if there'll be any benefit in it now
 
  E92 M3,172 track car
They're about 12-15 quid each to look so you could soon been in new cost territory if you have all 7 cleaned.
 


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