A 97 is very easy, the location and price makes it a good do it yourself job. That computer is very sophisticated, it contains programs for checking its sensors and circuits for codes called faults, all the codes meanings are listed here, and the small scanner that is sold at the store for equipment can help you decide whether its the computer or not. If he thinks it is, he must have read these codes, or found none, its better for you to make sure it is the ECU or not something else. Read about how a modern fuel injection system operates, there are many things that can go wrong, I worked with many Mitsu's and replacing the engine computer was rare, in fact, never.
After all, its made in Japan.
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Wednesday, January 6th, 2010 AT 5:38 PM