Transmission

My 05 Gran Prix won't shift gears automatically, I
have to take my foot off the gas pedal (going at
least 20 mph) then it will shift, but right after it
jerks a couple of times, it feel like it doesn't want to
go.  I already changed the spark plug wires,
replaced the ICM. also my "trac off" will go off and
on, as well as do door locks sometimes don't
work..Any ideas