The cable can stretch over time so a new cable could help. The gas pedal mod consists of putting spacers under the gas pedal where the cable attaches to it to tighten the cable up. If you google the gas pedal mod there are forums with pictures and how tos.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.