heavy load on generating syatem (alternator) while accelerating would show as an increased demand on your guages - but this should not affect the acceleration of the engine in a newer car - only ones 12+ years old -say - it would stop when going back down into first because you are thru with higher gears and not able to shift anymore - should not sound funny at 60 mph - it should go on into fourth or overdrive (depending on how you are driving) ... hope this helps
