Check engine light is on, they say multiple miss fire in cylcinder 6. but no one can find the problem van runs great

MISS FIRE COULD BE BAD SPARK PLUG OR COIL, PLUG WIRE BAD OR STOPPED UP FUEL INJECTOR.INTAKE LEAK OR LOW COMPRESSION.DO COMPRESSION TEST ON THAT CYLINDER SEE WHATS HAPPENING.

First do a cylinder compression test on engine to verify good engine compression this should be around 110psi to 175 psi check for vacuum leak, intake port for #6 cylindermay be leaking air, or also check coil for that cylinder, if wire and spark plug have already been changed, last replace fuel injector for that cylinder.