04 GT idle rattle??

should

My '03 GT Vert had a similar problem when I first bought it. I took it back to the delaer and they re-programmed the computer. That took care of it.

Good Luck.

THE COMPUTER!!

heh heh, :)

I think they just reprogram the entire thing

I have an 04 GT. It's in storage for the winter now, but I never had that happen. I really don't think it's normal.

You sure its not the fan cycling? Turn the fan off and see if it still happens.

Or the A/C compressor.

I get it when I use cheap gas, or right before it's time to change the oil.

My 98 V6 mustang did it too.

The car's Engine control module, ECU or ECM (whatever you want to call it) runs firmware that runs out of a type of memory called "Flash". What they normally will do is connect a programmer to the ALDL connector under the dash and download new code to the calibration areas (usually just cals). This does not mean that anything was defective with your ECU, just means that after your car left the production plant, the calibrators found a problem and have developed a fix.

John

I have an 01 GT 5 speed and I notice that you can feel the engine vibrate the car a little when you are stopped at a light. Actually my wife asked if something was wrong with the car, when she first rode in it. The only difference with what I feel is that in does not come and go every couple of seconds. Is your idle staying constant? What is your idle RPM? Is it manual or automatic?

That's exactly what I get. It disappears when I use better gas (still 87 though)

I don't have any variation in my RPMs like you stated. I would possibly have another dealer look at it. Something is not right.