oil pressure light comes on when stopped goes out when driving on 1999 Plymouth Breeze

just started i had the oil changed and now it goes off and on

2 answers
make sure that the oil filter is on hand tight. Could be the oil sender switch is defective. Check your spark plugs and make sure that there is no oil on the threads
Have oil sender removed and have pressure tested and replace sender as needed. Did you check the oil level? You may have a bad oil filter, also.