Multiple Cylinder Misfire 2000 540i

Last week my ses light came on and the car started idling rough. hooked up a snap on scanner and it stated that the intake cam one was advanced. There was some slight chain rattle so i changed the tensioner, noise got worse so I did some searchng and found that some people use the old spring on the new tensioner. So i did that and the noise is gone, but the car idle was getting worse. I seafoamed it hoping it was carbon buildup then changed the plugs. Now I get multiple misfires on cylinders 1-4 with fuel cutout and still the intake advanced code. The car runs horrible. I am thinking about changine the cps but have no evidence from the code reader that it is bad. im hoping timing didnt jump while the new tensioner was getting oil. my brotherthinks I should swap cps with 5-8 and clear codes and see if the same code comes up for 5-8 . Any suggestions would be greatly appreciated.
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