What could be wrong
my Impala will shake and stall amd cut off when I
get to a red light or a stop sign I took it to
Autozone put it on the machine and it needed a
knock sensor I have one put on the next day and
shuts off again what could be this problem
The knock sensor will not cause these issues. Bad fuel most common. Add fuel dry to the gas tank. If not there is a list of things, idle air control solenoid, vacuum leak, faulty purge solenoid, vacuum leak, fuel regulator leaking fuel into intake through vacuum hose/line, ETC...