Skibug, our has 111,312 miles on it. I agree with you about a lot of our truck are having this problem. I have done our without pulling the intake or anything else. This is a pain because it is very hard to see and hard to get your hand in to feel your way through this. I did unhook the drivers side plug wire from the coil pack, unbolt tthe coil pack from the bracket, and move it to the side for a little more room. I dropped the synchronizer hold down clamp to never find it because it never fell to the ground. I used a 302 distributor hold down clamp. Where did you buy everything from? If you bought this from RockAuto, I wish you luck.
Msmith65, I would not reccomend trying to do this without the tool on the 4.0L. I could hardly see what I was trying to do but I didn't remove the intake or anything else. If you can see, you can probably get away without the tool.
Mikeri, the chirp will get louder and be around all the time. Our was only there at the first start up of the day. Then it would come and go while driving. At that point, I decided it was time to do something about this. As I have said, I took the original apart and cleaned it but this only worked for 2 days.