Suzuki Forum - Suzuki Enthusiast Forums - 2004 suzuki intruder vl1500

Hi , having problem with my intruder , riding arround 30-50mph after a couple of miles it start cutting out and after go on the highway work good doesn’t cutt out , the bike is running too rich , my plugs are black , last year was try changing the jet lower and still doing the same thing
Add cobra straight pipe and open KN air filter , got a kit from 6stig and still doing the same , clean carb install new carb kit still doing samething , install back original air filters and pipe and still doing the same thing, tryed with the air fuel mixture and got my carb calibrated and still the same problem
Can someone please help me with this
Thanks