2007 Cadillac cts misfire

Asked by Kevin Jan 18, 2020 at 08:26 AM about the 2007 Cadillac CTS 3.6L RWD

Question type: Maintenance & Repair

I have 2007 Cadillac cts 3.6l with 91,500 miles on
it. It say for about a year and then we started
driving it again for a while. We got the oil changed,
tires rotated and all that good stuff haha. I had a
big long question typed up but then it didn't post so
I'm simplifying this one down. About 5 months
after driving it again it starting to have a very slight
single miss. Over time it got worse. We didnt drive
the car often anyways so we parked it, it was
honestly a back up car, my wife drove my car and I
have a company van for work. Still drive it though
keep everything moving and the misfire has gotten
pretty bad now. Cold start now it takes off great
and idles just fine! But once it idles for a few
minutes or you drive for a minute it starts missing
and it will let you know it!. Pretty much once the
engine warms up. I'm changed the sparks plug to
see if that helped, nope done nothing. Friend of
mine suggested running some seafoam through
since the car sat for a while to clean it out. It ran
perfect for like 3 days! Then we straight back to
normal. I put injector cleaner in the gas tank 2
separate times and both times the car ran perfect
for 2 days. So I replaced the injector, that didnt fix it
either. Please help! It's a nice car and I'd love to get
this thing back on the road running again, please
and thank you!

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