Surging in park
Hello I have a 2004 Cadillac cts, seems like once a
week it gives me this problem, it surges in park,
.Before the problem starts it has no power, I mean I
can floor it and it won't get over 30mph. And also I
noticed when this happens the car seems to be
louder, I mean it has a deeper tone hum coming
from the tail pipe...service engine soon pops on
radio, then after 2 days of acting up it's fine...it
runs like a champ...quite and steady. I'm fed up
please help before put bullet holes in it n scrap it.