I recently had my hot water shower installed, I now have noticed that when I run the hot portion of the shower it causes my engine to idle really rough. I increase the rpms to 2000 and it cleans up but it will stay that way for the rest of the day. charging systems checks fine. Took it in to the shop they counld not find out what it was doing it said the cpu was fine and no error codes. ran like a champ until they also used the hot shower. what could this be??????
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