So after no responce, I moved on and stumbled across Joe Goodnough who wrote the programs for VMP. He is now on his own and tuned my 03 which I purchased new. After 20 years of putting up with a tip in buck, at any rpm, Joe identified the problem with just a picture of my underhood.The first...
Ordered my Cobra in July of 02. Received the car first week of October. In 2012, I put a new Motorcraft battery in thats still in in today. The first battery never let me down, I just replaced it due to its age. I still have the original.
I' ve ordered an aftermarket boost gauge as a diagnostic tool. I'll tap it in to watch for any boost loss more accurately. After all your excellent responses, I'm leaning towards the high temps that night. I'll let you know the results after the next trip. Thanks to all for the input.
CapeRCode