MY car is having issues its a 2001 mercury cougar and i took ti to peopboys to get fixed because it misfires all the time and stalls and has a rough idol at first i thought SPARK PLUGS went bad or out, i had to have it towed to pepboy swhere they thought it was the ignition coil and a o2 sensor etc.... welll they replaced those parts and they still cant figure it out they think it has something to do with the wiring or the onboard computer on the car. and recommend i take it to a dealer, which is fine but i hear delears are SUPER expensive how much do you think this will cost me?