As I drive my car with b16a, it's runing pretty good. My speed was around 60MPH and suddenly it's the speed went down, I push the gas but can't increase the speed. At last, I can go only up to 3,000 RPM. I can't not go any higher than 3,000 RPM. I don't know why it's does that. I tried my other ecu, but it's does the same.....Any help...PLEASE. Thanks ahead of time!

 

it is called limp home mode.. and usually occurs when an important sensor has failed. you can check codes on your ecu to find out what sensor is causing limp home mode.. and then replace that sensor. search on h-t for how to check codes, and ecu code definitions.