2000 Honda Accord won't rev passes 3000 RPMs

I currently have a 2000 Honda Accord LX, 4 cylinder Automatic. It currently has 220000 Kms. Most of the clicks are high way clicks.

I have always had it serviced at the Honda Dealership that I first got it at. I has never had any problems till now.

All of a sudden when I was driving my rpms wouldn't go over 3000 rpms, it just kept on rocking. Then I took it to the dealership and they checked the whole car and said it was a distributor problem, so the replaced the distributor and it worked fine until a few days later same thing happened I wouldn't go part 3000 rpms, it kept on rocking when I tried to go over 3000 rpms. I took it in again, the mechanic at Honda couldn't find any problems with the car, he said he cleaned the sensors, but could not find a problem. Then I was drinving on the weekend and it happened at night time and since the dealership was closed I couldn't go there. So the next morning I tried driving the car and when I went past 3000 rpms it was fine. So I tested it and reved it high. I got to 5000 rpms and it started rcocking like it did at 3000 rpms.

Even though the distributor was replaced there still seems to be a problem. All wire were checked and everything passed.

Any ideas