93 acura legend, help please!!!!

I have a 93' Acura Legend LS. while i am in idle the car jerks every couple of seconds. sometimes it gets as bad as every second. it happens when i am in park and in idle. when it happens the lights dim in the car i.e. dash panel radio and headlights. etc. i have no clue what it could be. i had a tranny replaced about 300 miles ago and about 3 weeks after that it started to jerk. any help would be appreciated.

i really need help with this, someone told me it could be a piston missing and not hitting on time? any help would be appreciated.

Sounds lilke one of the spark plug boots or a bad coil pack... does the car rev up when it "jerks" or does it cut out?

it doesnt do either it just jerks lightly the panel lights dim as well and its rpms are at about 500 when in idle. i dont know if that is low someone told me it should idle at 1000 rpm.