Hey is this happening to anyone else? I have a 98 SVT and when my fuel gets to about a half of a tank, my secondary throttle butterfly doesn't open. It has only happened twice, (that I have noticed) and I assume that it is a computer program that saves gas. But I am not sure if this is normal operation to save gas, or if there is a problem that I need to address. I recently changed the oil with synthetic, changed the serpentine belt and added fuel injector cleaner. I always use the highest octane possible. I have been getting low to mid-twenties fuel economy. Thanks!
