Afkari Aziz

Hi I have just got the car from the previous owner as i checked thoughly and it seem to be running fine as the previous owner replaced the ignition coil for misfire clyinder 5 which he got scammed by the workshop upon me checking the ignition coil is the same old one that still have clyinder misfire then alas i checked the intake mainfold and was modified to remove the 3 ball ones with tumbler flap. I am not sure if its a good idea and what is going to happen to it? Also the car is jerking after i got the car. It jerks while i accerlate and brake to stop. I scanned through and trans seems to be apparently fine? Maybe low on fluid?