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So I took it to these local guys that run a small bmw shop. They walnut blasted it for me, and changed the plugs. They said the plugs looked fine. They took before and after pictures of the intake valves and port, wow what a difference. The walnut blast and spark plugs got rid of the misfire, the car runs fan freaking tastic now.
so the sequence of events I experienced was:
1. p29f3 LPFP sensor failure, along with misfire, replaced LPFP sensor, still misfiring - it was the same cylinder creating the check engine light when misfiring. I had no long cranks, but i began getting idle misfires. The longer it got cold outside the worse my car ran.
2. walnut blasted and plugs changed. Car runs like a top. plugs didn't look too bad, intake valves and ports were caked pretty bad - car is at 37000 miles at this point.
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