Car running rough/ brakes not working properly. Check engine and VSC lights on. on 2002 Lexus RX300

codes reveal misfires on 3,4,and 5. In addition, periodically, the brakes do not stop the car. They slow it down, but after one depression the pedal becomes extremely hard, like pushing on a rock, and does nothing to help stop the car. Can these issues be related? (It has been extremely cold outside.)

Asked by for the 2002 Lexus RX300
There is a vacuum circuit problem for the brake booster. It is possible misfire is related. The vehicle needs to be checked out by a mechanic hands-on!
1 more answer , 2 more comments
with misfires there is not enough vac to work brakes properly,seek diag and est
Update: Had the timing fixed and now the brakes work just fine. Weird.

Thank you for your help!
Incorrect timing can drastically effect vacum!! Glad it's fixed!
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