If by idles down you mean dieing, then its more than likely old/bad fuel. If it doesn't die its just the startup/warm up process.
670 mph = about 1,078.3 kph
The Lamborghini Gallardo has 550 bhp. The Lamborghini Murcielago has 670 bhp. (People say it brakes down every two seconds)
About 105 mph give or take
670 mph = 1078 kilometres per hour.
670 616 629 mph
23% of 670 = 23% * 670 = 0.23 * 670 = 154.1
80% of 670 = 80% * 670 = 0.8 * 670 = 536
670.
670
0.0134
670
670 is ten times bigger than 67.