phum wrote:
I cant find any fuel leaks , no air in the system after 10 hours of sitting.
I have ordered new fuel filters just to be sure.
While reading the following, keep in mind that I'm not a fan of throwing parts at a problem. With that said, here's my 2¢ regarding air in the fuel:
This is a problem that can be difficult to convince people they're experiencing - at least, it certainly was in my case, and I know that I wasn't the first to be stubborn about it. Last Friday, I finally installed an in-tank fuel pump and (even with other issues going on), there was a noticeable improvement in starting, idle, and responsiveness. There are other things that need to be addressed that I'm getting ready to go outside and tackle, but until I could feel the difference between not having an in-tank pump and having one, the reasons for installing one were largely academic. Sure, I knew it would be an improvement over stock, but because the KJ was basically working I largely considered the upgrade to fall into the category of, 'it'd be nice to have one day'. I'm now of the opinion that it should be one of the first upgrades done on these vehicles.
I'm mentioning this because you're in a similar boat to me (multiple issues at once), and are going down some of the same troubleshooting paths. I didn't have fuel leaks either (air-in-fuel is typically caused by suction of air into the lines, not leaking of fuel, so you may not see fuel leaks), and two filter changes didn't make any difference, even with the revised fuel filter head in place.
I'm not saying you have to install the in-tank pump right away by any means, but it does sound like air in fuel is an issue for you. I don't doubt that there are other things also going on, but you may want to give this upgrade more consideration than you might have been.
Out of curiosity, you say that there's no air in the fuel. How did you test for that?