...car to a mechanic shop and had the? following done: head cylinder, gasket set, thermostat, oil and antifreeze, spark slugs, wire set, egr valve sensor, belt and idle pully for a total of 86.52. It still ran rough so i took it back and they charged me 5.00 to replace the fuel injector. It still runs rough and the engine light stays lit. Can you help me? I've been the only owner of the car and has always ran great until now.