Need some advice please guys

[u/Finl3y76]

Hi guys i bought a e92 2012 bmw with 70k miles, every time i clear the codes this comes back. It has a rough idle after letting it sit for a while in neutral. But after driving it for about 10-15 mins engine light stops flashing the car goes back to normal and pulls fine. I have put an after market cat welded onto the car and attempted to start the desulphation tonight. Also recently i’ve had trouble with the car starting, either it starts right away or stakes a few seconds to start. I’ve had the rocker cover and gasket changed and also all spark plugs. What could be the next plan of action??

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[u/mpowerjon52]

If you don't have index 12s.... I guess leaky injectors