This is really interesting. I asked the same question in the ENFP forum and it seems with them there's a lot of outward expression of feelings that they don't always understand, while ENTPs don't tend to act on or express their feelings, but are usually able to figure out what they are and where they're coming from.
I recently had a conflict situation with a friend who is a feeler and it was a perfect example of our differences in action. I was mad because I thought he was being an ass. I had to talk to like 10 people about why I was justified in feeling that he was an ass to be sure that they too reached the same conclusion. Once I'd talked through the situation enough, I was able to come to the conclusion that my anger was indeed am appropriate emotional response. Then I was like "dude, you're being and ass". I said my peace and was kind of over it at that point. He stewed about this for hours and then exploded--we're talking like crazy out of control yelling nonsense. I just let it roll of though, because I knew I was right. But then again, I always am ;-)
I used to question whether I might be an ENFP, but I think it's pretty clear that's not the case/