Facing an issue with my N16 (qg13de). The car started having bad fuel average. I swapped the air filter, cleaned the tb and swapped the spark plugs. These were denso and I gapped them to spec before installing. However, on a long trip following this, the car started stalling everytime I slowed down. I also heard a backfire and decided to swap NGK plugs.
Now, the bad fuel average has improved and the stalling issue is resolved but I still get instances where the rpm drops even at constant speed. Feels like the brakes are applied for a second and then let got. Plus, in drive or R with the brake pressed, the rpm drops to 500-550, almost close to the engine shutting off.
I'm in Islamabad so if anyone can point me out as to what the issue could be and also if I can can show the car to someone with a scanner would be greatful
@SER_GTR @capsat @star2 @Xulfiqar