finalstage1

my best friend has a 1996 impala with an lt1 . if your cruising down the freeway at like 60mph and jump on it the car accelerate just fine , but when you get to 75-80 the car will lose all power for like .5 of a second . it feels like the car dies for a split second . we scanned it and the scanner said bank 2 heated 02 failure , so we changed the front 02 on the passenger side and the car still does the same thing , but the code didnt come back . what do you guys suggest we look at now ?