I had the same exact problem with my 98 Civic EX 4-door. If you are a purist you won't like my answer, but here's what fixed it. The TPS went bad, so I replaced it with an aftermarket (Dorman). Since the new TPS had bolts that could be loosened, unlike the factory TPS, there is a small range of adjustment on the new TPS. I rotated it slightly so it appears to the computer that the throttle is open slightly more than it really is. That resolved 99 percent of the flaring. It took me several tries to get the adjustment right, and shifts are often at higher RPMs than before, but overall I am much happier!
Monday, September 10th, 2012 AT 6:49 PM