well it idles fine once it warms up but when its cold the idle used to go up to about 3000rmp and down to like 300rpm but with the walbro now it stays at about 1400rpm until it warms up then it idles fine at about 700 rpm. I dont know if the ecu is chipped I bought it liked that and I have not tried opening it to see if it was. Also what I mean its not doing what its supposed to is it dosent feel like it pulls as hard as it supposed to I ran it at the track and I ran a 15.7 on stock tires with the stock pump but I dont know what its supposed to run.