94 Grand Am - ECU question

My car developed the unfortunate habit of pausing. The "check engine" light would turn on. Then that light would turn off right as the "low coolant" light would turn on. Then that light would turn off and the car would jerk for a moment as it stopped accelerating. Then the cycle would repeat with everything happening at a perfect tempo. This would only happen when I was accelerating. I took it to get repaired and they replaced the ecu. The problem stopped for about a week then it started again. It was nearly as bad as before but it was getting worse quickly. I took it back to the garage and they found that the wire harness attached to the ecu was bad. I asked if I needed my computer replaced before and they said yes but I didn't need one this time even though it was doing the same thing. How can you get an accurate test on the ecu through a bad wire harness? Where is the ecu in the car so I can inspect what they did to the wire harness myself as some of the things they told my made no sense from an electrical perspective. It seems to me that the problem was caused by the harness and got better because they moved the wire harness when they replaced the ecu. Probably through ending a short or scraping off corrosion. Anyway, I would like answers to the previous questions and an opinion of someone more knowledgable about car electronics than myself. Thank you.

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nerdboy
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