So I’ve had this car for about three months and it’s had a weird issue running since the day I bought it. Anytime I start it and it’s cold it’s runs good until it’s warmed up but after it’s warmed up and I drive it it starts to sputter when driving it almost seems like it has a misfire but it’s only noticeable when you are stopping and going I have no idea what it could be I looked at the spark plugs and they seem fine just a little worn but I’m starting to think it’s a cool pack issue I’ve gone through my vac lines and it seems like there is no leaks