Engine makes rattling noise?

Ok so i have a 1990 acura integra all stock and just yesterday i was driving home when a honda civic wanted a little challenge on the road so i gave it to him knowing his car sounded more upgraded and new it probably wasn't stock like mine but after that my car started making a rattling noise when i accelerate i noticed i was in fourth gear and was going about 80mph and it just wouldn't go hire than that and i was flooring it i wanted to see it go a little hire before i put it i'm 5th but it wouldn't iknow i did treat my little old stock car bad yesterday but now i need to know exactly what that problem is its my daily driver any help would be appreciated thanks! The rattling seems to come from the bac of the engine sounds like in the bottom not exactly sure were its coming from!

It could be your valve clearance. May have that checked. I honestly think it's just something stupid tho. Like the engine cover. If it's a loud rattle tho go to the dealer. I've heard that problems with manual transmissions start with a rattle.

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