Mid range intermittent loss of power

Vish_335i

New member
Hi Guys, wondering if anyone experienced a similar problem to the one I have now. My F30 335i seems to flat spot sometimes mid rpm range when I try to accelerate. I did notice that the fuel consumption will hold at around 10L/100km during this time and then when the power comes back the fueling goes back to normal. No warning lights, no jerks nothing.

I did have my exhaust actuator welded in the open position recently as it began to rattle loudly, wonder if this may be the culprit. Thanks in advance for you help.
 
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