I was driving in almost 100F heat today. I suppose the heat killed my ECU. The engine runs just fine, but only after I reset the ECU. As soon as I start up before resetting the ECU, the car bucks like a mule and throws a CEL. A VAG-COM scan revealed an "internal control module ROM error." In short the ECU is toast. A new one is $1,400, but luckily one of my Audi friends lets me have a good one for $300. That's the closest I have come to breaking down with this car during the past 10 years and 138k miles! The other close call happend when the gas pedal broke off.