Recently my Impala started losing power when RPMs get around 4000. The first time it happened the check engine light flashed on/off, which the user manual stated as misfiring. The engine would not rev past 4K and pushing the pedal down further had no effect. The light only flashed and did not stay on after RPM's dropped below 4K. A computer scan showed no codes.
It still is happening, only when above 4K RPM, but the light no longer flashes. Below 4K the car drives fine. Still no codes in the computer and the light is still off.
Recently I put a bottle of Regane injector cleaner in the a full tank, and after that tank was empty refilled with 93 octane (typically I use 87-89 octane gas). I'm not 100% sure the problem started after this but it's probable because I never noticed it before the cleaner.
Monday, March 13th, 2017 AT 3:34 PM