Possible intake manifold air leak. Try spaying water around intake gasket and see if rpm changes. Faulty front O2 sensor, faulty MAF
What year vehicle ? mass air flow or speed density fuel control . Do you have a scan tool that can view sensor data . What are the fuel trims ( short & long term ) showing ? PCM problem ? O2 sensors stuck lean , adding propane , do the O2 sensors go rich ?
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
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