i have a ps9 1 wire vtec ecu, it idles fine on 1 of 3 different chips i have, one is a basemap and 2 of them are tuned, the basemap is the only one vtec will work on but it runs so ------- rich i got 18mpg and the idle revs up then down then up and down, and just dies at stop lights, one of the tuned maps i have idles fine and runs great its almost as fast as my basemap with vtec the only prob is vtec doest work on this one, pat and me made sure all the boxes were checked and it still doesnt work, maybe just reburning them would? let me know.