The plug was completely fouled and carboned from tip to contact, it was not firing. The rest of the plugs were white. Indicating a lean condition It's an 87 with an 86 5.0 What are the causes of my symptoms and what can I do? Is it time to save for a ford crate 5.0 315 HP complete engine for 3200.00? I am not sure I want to put any money into this engine...or should I?