Code p0170 error code 0170 comes up, starts rough for about five seconds then purrs perfectly, runs fine up to half throttle any more and the 02 sensors shut down and she losses power. changed fuel filter,spark plugs, leads,o2 sensors, checked fuel presure, change fuel injectors,checked for air leaks in manifold.

SOURCE: 91 honda civic dx 1.5L quit running properly.

bro, check ur main relay. its under the dash. replace it, check also ur distributor(replace it). and also your ECU

Testimonial: "right answer but I received it much too late. I went to a mechanic and paid him to fix it."

SOURCE: 91 LEGACY STARTED RUNNING ROUGH

The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.

SOURCE: Chevy truck '02 surges between 45 and 55 mph

you should change the tps( throtal position sensor) this can cause that problem

SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

SOURCE: I have a 2003 Expedition

Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
Randy