I bought my 1500 in most awesome condition. It´s a 97 but its been sitting for 19 years. It had 4388 miles when I bought it. My issue is when the previous owner put the Vance n Hines straight pipes on it. He never retuned the carbs. I am only getting like 50 to a tankfull. Is this a simple re-tuning or is it shop work ??? I am a very capable machine mechanic.