Looking for some advice. I am currently looking at possibly buying a 2004 f450. It has a v10, and has 100,000 miles on it. I was was planning to use it as a sealcoating truck and putting a 550 gallon tank on it. I have heard alot of problems with the Ford trucks having problems with spitting out spark plugs,etc. I was wondering if anyone has any personal experince with these trucks. thanks in advance.