Car surges on idle and driving and while stopped

Refer to this link for more information: https://www.2carpros.com/articles/engine-surges

Just to add to this one have you checked for codes yet?You said you replaced the plugs you didnt put platnuim plugs in the engine did you?Also did you check the plug wires to especaily the coil towers its common for them to get corroded. Also did you check the coolant temp sensor and the connector for being corroded?Its really common for the coolant temp sensor to go bad and connector to become corroded on that car. There are two coolant temp sensors on that car the top one with one green wire to it is for the temp gauge. The bottom one with a black wire and a yellow wire going to it is the coolant temp sensor iam talking about. That one sends the temp to the computer so it can turn the radiator fan on.A bad coolant temp sensor can cause surging dieing no starts overheating no starts hard starts all kinds of different symptoms.