I'm assuming this is the right location, but if its not, please move to appropriate place. Ok I have a 1990 crx hf with a b16a and a pr3 mugen chipped ecu. The car has ctr cams, intake/header/exhaust. The first problem I notice is the car idles between 2200-2700 rpm always, doesn't really affect how the car performs but its a little annoying. Any ideas what thats about? My main concern is that I was driving pretty hard the other day, and the highest I usually rev it up to is 8500 rpm with no problem. But I got the chance to run against a carrera 4, and thought it would be fun to see how my car compared to his, but when I punched the gas it felt a little more sluggish than usual, and at 7000 rpm, the engine sounded as if I was reaching a rev limiter. When I checked the ecu, a code 6 appeared, which is the TW sensor. I checked the sensor, and the wiring leading up to the sensor, and could not find any flaws. I don't think its the sensor because the code doesn't come on all the time, and it doesn't come on consistently when I drive the car hard. Any ideas what this could be? The last issue I had is that whenever I put the car in reverse, the tach drops to zero for some reason, I'm guessing a short in the reverse lights, but any suggestions would be greatly appreciated. Please leave me anything I should check because I will be checking all this stuff this weekend, so if anybody has any heads up, I would be thankful, thanks in advance.