"Darkwing" theducksmail"AT"yahoo.com wrote

Had an engine run rough for about 3 seconds during a downleg on a cross
country right after take off, probably could have made the runway but
still
my heart fell to the bottom of my shoe. Had another 2 second engine
roughness at altitude during a cross country, had an airport pretty much
below us, still not any fun. All this in brand new 172's with fuel
injection!

So did you ever figure out what was causing the rough running?
--
Jim in NC