1993 Honda Accord car jerks forward when placed drive (D4)

Your accord is slipping out of gear..check it one more time..

just that, try it, in a safe place,
i have 96 jeep with no belt, in fact pump missing.
the pump is optional in most cases, because no body wants to die.
belt flies off.. it just reverse to manual mode.
the only possible issue is lub, for the rack-and-pinon.

sounds more likely to be a warn sensor could be cam or crank sensor, its not being able to read engine speed to adjust time.

Its located underneath the drivers side door, about a foot towards the center of the car. depending on the tools you use, and how rusted the bolts are, and your expirience, expect to be working on it about 45 mins to and hour.

Then your vent control is not working, since this is a 1993 you would be able to see the filter drier ice up on the enternal area.Also make sure the heater control cable is not engage

IAC or MAF sensors could cause especially at idle

google= how to place a timing belt on a 1993 honda accord

Sounds like you may have a bad ground somewhere or a bad power connection.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

have someone hook up with better scan tool that reads more than code 6

Go for a scan