Ive been working on a 99 4 runner and I'm stumped. Car had a cold start misfore. Shop told the owner it was a leaky injector. We replaced all six injectors and now it misfirs constantly and is nearly undriveable. Ive put a stethoscope to all six and they are clicking away. I dont want to take it apart again. No codes either. Did briefly throw a tps code but i may have not plugged it in on a startup. Cleared and it didnt come back. Job was simple. Dunno what couldve went wrong.