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Recently bought a 735i 2002 model 88000 miles, nice car but has now an inconsistent misfire, I have changed all plugs and coil packs, crankcase vents, air hoses from crank case to inlet, I have a thin pipe going from air box like a vacuum hose which is perished but not changed yet. I have done oil and filter as well.
The other night when I changed air hoses the car ran worse but then had a diagnostics done to relearn adaptations etc, running good afterwards next morning started and ran fine until I had to pull over and pull away again it started misfiring again, just like had a delay/flat spot trying to pull away, every time I run code check it’s alwAys been misfire in cylinder 1 and 3

Any suggestions?

Thanks
 
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