1993 Mustang running lean after installing GT40 heads
okay when i put gt40p heads on my 93 stang the top of my pistons were a orangish color and so were my plugs, but i heard that can happen from running fuel additives which i did alot. but everyone says its running lean because its burning so hot and i only have a msd coil on my car, but when your sittin there idling you can smell gas fumes really bad so i don't know how to tell that?? i'm going to get 2 hours of dyno tuning but it'll be next month so will it mess anything up or how can i fix it? any suggestions will be appreciated!!