everytime i drive my car it likes to die. mostly when i come to a stop never when i drive but the rpm guage likes to jump around. I had to replace the opti not to long ago probably has 300 miles on it. all clynders fire new spark plugs ac delcos not wires. im debating if its my ignition switch. when the car dies everything is still on ex. the radio. also when the opti died my father switched out the ignition switch. the the previous owner gave it too me saying his old one blew...... i wonder if its it. also when the car dies the abs relay makes a noise pulled it out car ran fine put it in car dies. all grounds are nice and clean and ohm out correctly. this has been happening for those 300 miles any help would be awsome thanks.