I have a p0455 on my 2002 ford ranger edge v6 3.0 and i took it to an autoshop they said they smoked the evap system and found nothing wrong. But in the past ive had the code and cleared and it came right back. Is there any ideas here on why i can get this evap leak code? The guy also said there smoke coming out the vent solenoid in the back of my truck he said that was normal? He also said loose battery terminal could cause it? Idk about that. I've replaced the gas cap a month ago but the code was still there.