Ca18det motor issue

[Sil_Eighty88]

So when I first bought this car a couple weeks ago it seemed fine, but after about a couple days later i started to noticed it hesitate a little bit under power(just for a split second). Now it has progressively got a lot worse, when idling it bogs down almost to 0 and almost just dies, then goes back up to a normal idle then back down. If I try to put it under power when it does that it has no power and just sputters. I dont know what the issue is. I just put new spark plugs and a new intake on it. Please help!!