Oh. I didn't know he replaced his ecu. He said he didnt want to on his first post... Go through all the Fuel(electrical) that makes her run and check it off, Then the Spark (electrical) and check that off, next, and last the Air (electrical). If still everything comes back fine, then you probably are gonna have an internal issue going on. (but like you said, It is an intermittent issue so u need to run each test for a minute or two to see which one or any is acting up.)