bucking in idle while at stoplight
 

hi guys i need some help on this one. i have a 98 sl2 thats want to buck when im sitting at a stop light, and from time to time it will stall out while sitting at light also . it only does it when i have it gear. if i shift it to nuetral it runs smooth as can be, but as soon as i put back in drive it starts bucking. now i cleaned the egr valve, replaced tps senor, iac valve , and cleaned the map sensor port hole on intake. also the ect sensor is about 1 and a half yrs old from autozone. i also cleaned the ignition coil towers, but not the igniton module. also i havent done the can trick to see if egr valve is bad. also i have to prime the fuel pump each time to start car if that has anything to do with my problem. i know these care have known issues ith the fuel pumps. any other suggestion would be greatly appreciated. as of right now im stumped.