A mechanic replaced our piston rings after we noticed an oil leak. He also took apart the whole motor and carburetor, cleaned all the parts (including reseating the valves), and put it back together. Since this repair, the car idles irregularly and stalls at idle despite repeated carburetor and throttle adjustments, and the engine runs rough and makes a prominent sound like an exhaust leak when accelerating (we checked and have no exhaust problems). We had the brake servo and vaccuum line checked, we were told they were ok. Upon inspection, one spark plug on each side was blackened and the others were white. There engine has a reduction in power, and hesitation in the middle of the power band, since the mechanic did his work. Can anyone tell us what might be wrong, judging from these symptoms?
Friday, May 25th, 2012 AT 4:45 PM