No mods and i have had i plugged in and no codes. No noticable misfire. It Only happens when i first start the car, it is fine after that. When the revs drop it bogs down and doesn’t make a difference how far i push the accelerator, after a couple of seconds the revs pick up and its fine
Would clean out the intake throttle see if that helps other thought is engine coolant temp sensor possibly out of spec giving ecm incorrect value when cold ,could be difficult to find if so intermittent .
Update, So i cleaned the intake throttle that was already pretty clean, i also got a new map sensor.
Im sure it is running rich, it now bogs down under 2000rpm almost all the time with the occasional backfire, there is still no codes showing, i have ordered a new coil pack that should arrive today, im hoping this will help.
Where is the engine coolant temp sensor located so i can check that please