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Try this. There is a vacuum array on the passenger's side of the engine compartment leading into the box attached to the fire wall. Cap the first tube at the metal tube array with a rubber vacuum tube cap available a the auto parts store. The tube to cap is the one on top, closest to the bumper. I did this to my prelude after looking for the problem for years. It worked and the car runs almost as good as when it was new. The fix is to replace the vacuum switch insid the box on the fire wall, but I have not been able to locate a replacement yet.
Possible speed sensor. I know the speed sensors are a problem with hondas. A new speed sensor is about $200 and can be easily replaced. It bolts to the top of the transmission on the firewall side. Do NOT buy an e-bay one. They are only about $30 but are junk
With normal acceleration the 1st to second shift point should be around 2500-3000 rpm. Most of your shifts under moderate acceleration will take place at this same point or when there a light load on the transmission. Under hard acceleration the RPMs will climp higher due to increased power needs and the computer will shift when less power is needed or the RPMs climb to an unsafe speed say5000-6000rpms (depending on where yours redlines). Also going up a steep hill will raise the RPMs higher and goind down a hill will cause a faster shift at lower RPMs. These can always be altered by an individual owner by adjusting shift points, using performance parts and if you have problems (low tranny fluid/trans issues). Your trans RPMS are fine and will vary depening on how your foot accelerates. The shift pattern should be the same every time you drive slow/medium/fast/, look for changes in those patterns you will also catch a problem early.