I am new to programming the computer on cars, although I've worked on computers for 10 years. I just bought a 2007 Shelby GT500 Cobra, which is stock. Since the car is set up for 91 octane and it's not available at many gas stations I bought a SCT X3 from a dealer and he made a custom tune for me for both 91 octane and 93 octane.
Today I picked up the X3 and installed the 91 octane tune and immediately noticed that the car idles around 1500 rpm when I stop and doesn't slow down to 850 rpm for about 6-10 seconds.
While driving if I let my foot off the gas it feels like I have the cruise control on because the idle is still at 1500 rpm.
When downshifting I don't get the same engine braking effect either.
Is this NORMAL and how it should be?
thanks so much in advance,
meterman
Today I picked up the X3 and installed the 91 octane tune and immediately noticed that the car idles around 1500 rpm when I stop and doesn't slow down to 850 rpm for about 6-10 seconds.
While driving if I let my foot off the gas it feels like I have the cruise control on because the idle is still at 1500 rpm.
When downshifting I don't get the same engine braking effect either.
Is this NORMAL and how it should be?
thanks so much in advance,
meterman