Hi im new to this forum
I speak french but not english but im able to understand

Ok i have brand new spark plug,cap rotor and spark plug wire

First , My problem is like missfire the engine when it start cold after one day do a lot of missfire for about 15 second

But now it do misfire while driving like i put full throtle the engine run on 2 cylinder do buh buh buh take rpm ,run 3 cylinder buh buh buh and at hig rpm the 4 cylinder work correctly ...

The engine dont send me check engine light ... also i miss the primary oxygene sensor since a long time but one week ago i did't have it and there was no problem

please help me and thank a lot to take the time to understand me ...

Possiblement ton ECU qui fait des siennes... verifie le avec un multimetre. commence par verfifier le ground, il y a surment des depots de couleur gris-blanc entre le terminal et le boby.