Hi Everyone! I am posting for my Boyfriend. He has a 98 3.8 6cyl. Mustang, it has just started a low ticking noise on the left when he presses the gas pedal. It doesnt make ticking noise when he doesnt press the gas or is in neutral. We just changed spark plugs and wires a week ago, oil changed 3 weeks ago. He also just changed the Thermostat this pass monday. Any ideas of how much it could cost to get the noise fixed??? Any ideas on what the noise could be?? Thanks everyone!