I own a 1990 integra that I race on round dirt tracks. During my last race in this car, it started to stumble under a load at high rpms. It felt like it was hitting the rev limit early but I know something else was wrong. This is a list of things that a switch out or cheched:Map,tps,iat,ecm,distributor,timing,fuel pressure, and cylinder pressure. Well after all this it still had the problem. Keep in mind there is no exhaust except the header(manifold) so you can hear when something is wrong. If you blip the throttle you know its not fix right away from the sound. A friend stopped by to do a dye head gasket test. It cheched out fine. He wanted me to check the spray at the injectors. Well after I pulled the first injector he advised me of some car companys that put tiny plastic screens in the top of the injectors. Long story short,they were half clogged. I feel this should be added to the list of things to do at your next tune-up. The car has never felt better. CHECK YOUR INJECTORS SCREENS. I hope this helps someone.