I have a 1996 Toyota 4 Runner sr5 3.4l fi.. I am getting a code reading of a cylinder 2 misfire. have changed plugs, (dual grounding). coil on cylinder 2, and fuel injector on cylinder 2. The engine runs perfect untill I accelerate, no matter what the rpm. Once I back off the throttle, it runs perfect. Seems to only happen after the engine has warmed up about 10 min. Does anyone have a solution?