Since I had my car dyno tuned it has had an erratic idle and howl out of the air filter and when I hard excellerate it shows failsafe engine mode on the dash.. Ford found my air idle control was showing a bad code so I had to order an entire new TB to get the part. Needless to say it didn't fix the problem. The tuner called today and said to take the Whipple TB off because SCT told him on the phone that numerous GT500's were having tuning problems with aftermarket TB's on the electronic TB. Has anybody else experienced this problem? I think he needs to adjust his tune since it was fine before. :shrug: