problems with my 1990 240sx

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Hi guys, I'm new.My 240sx has hesitation and rough idling.I have done a complete tune up and still no real change.I noticed that my intake had come out of place from the black box under the car, when I put it back good there was a major change and my car ran like new for a couple days but now it's started up with the same hesitation.Does anyone have any ideas what it could be.Oh in tuning up the car I put bosch plat4 sparkplugs.I don't know if that has any neg effect or benefits.

posted by  spidermannsx

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