I am the original owner of a stock '03 Cobra with less than 19,000 miles. Periodically, after full-throttle acceleration , RPMs fall (close) to idle during up-shifting even though I stay below the red line and make a snappy shift. I notice the problem when I attempt full acceleration in the next higher gear. For a second or so, the engine will not rev and the super charger is silent. RPMs will then build and I have super charger action again. Any ideas as to the cause would be appreciated. I have had no similar problem with any normally aspirated performance engine with a manual transmission.