My 2001 Ford Ranger is having trouble accelerating when I press the gas pedal aggressively to pass on the freeway. I've taken it to a few mechanics and I've had a diagnostic run and they keep getting a code of P1309. I've read a few post that say that I need to change the spark plugs (that's what a few mechanics have suggested as well). Has anyone else had this problem? I would greatly appreciate any feedback or guidance on this subject!