Sudden loss of throttle response on the highway!

Dreambuilder

I have a 370Z 2014 purchased new in Dec. 2013 and have since put 65,000 miles on it with no issues. This model has the 7 speed auto. Leaving from work 1 week ago my Z did just that after a few minutes of driving, step on the gas and nothing. I drove onto the highway and steadily reached 65 - 70 mph but a very slow climb almost like the engine was starving for fuel though I had over 2/3 tank. I pulled over and walked around the vehicle to listen for odd engine noise but it all sounded normal. So I shut it down and started it back up and still the same. I continued home and turned it off for about 5 minutes while I contacted Nissan and drove to their service center which happens to be less than a mile from my residence but this time the car was fine and Nissan could not find any problems. The next day exactly the same shortly after leaving work except this time I drove it straight to Nissan while it was exhibiting the symptoms. They plugged it into the diagnostic reader which gave them an error code then contacted a Nissan engineer and determined that something is defective with one of the throttle bodies and needs to be replaced. Apparently this is something that has manifested with several of the 370-Z's on the road and Nissan is aware of it. We shall see if that is the case. It has done it 1 more time when leaving from work but no other instance so far. I am debating their quote of $1,700.00 to replace them, are they trying to tell me that both need replacement or is this for one. I see them as anywhere from $150.00 to over $500.00 each and then the labor for install, how much are they charging for that. Anyway I think we are talking about the same mechanical issue.