Engine Performance problem
2004 Kia Sorento 6 cyl Two Wheel Drive Automatic 55000 miles
an engine ight was on. I took it to a chain auto repair shop. I was charged 364. They replaced the #spark plug and the alternator belt. They said they had to remove the intake and test the plug coil/injector. Does this sound correct. It seems an excessive amount for a spark plug and belt?