91 240sx puff puff

[destroyyourmind]

so my 91 ka24de is running weird . I replaced my entire intake manifold, lines blocked off egr and got rid of all of that stuff car has been running great until I pulled off my header plug closest to the firewall to fix the leak on it just a big bolt welded up so after I weld and put it on my car sounds like a** the idle doesn't drop and die and it idles and revs fine but its shaking violently and puffing no smoke but it puffs over and over from the exhaust

[destroyyourmind]

nvm found the problem fuel injector o ring on cyl. 1.