REPLACE/REMOVE FUEL INJECTOR Questions

I Bought A Car And It Won't Start And When It Does It Is Insanely Shakey And Dies After 10 Seconds. White Smoke Also Come From The Exhaust (...

Just Needing To Know The Basics About Possible Replacement.

No Fuel Injection At All, Spark Is There. Ecu Replaced, 2 Different Ckps. Continuity From Injectors To Ecu Is There. What Gives

Once The Ignition Is On Injector 1 And 4 Sprays More Fuel On Top Of Piston But I Changed The Injector Still Doing The Same Thing