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You mention rough idle, the famous n52 cold engine shake, or more severe ?
What gas are you running ?
Oil type and how frequent ? Vanos solenoids can get clogged making the situation worse
Don't buy into their fuel injector service, especially at that price..Go to your local parts store, advanced,autozone, whatever and get a can of "Seafoam" throw it in your gas tank, call it a day..
Ticking and knocking are different sounds, knocking is a big big big no no..N52 can develop a slight ticking, you already had your head replaced once which is the fix according to BMW, how often is the car driven ?
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