Assuming the MKIII you speak of is a Superformance MKIII (your question is posted in the Superformance area of CC) No chassis nuber was provided that is sometimes very helpful to get proper answers.......
You made quite an open statement with no details. BUT, I'll take a chance that the accelerator pedal issue is similar in nature to what is covered here.
Helpful Tips
Regarding documentation on the Superformance MKIII....
2nd Strike makes a fantastic owners manual for the MKIII.
There are also some Service Bulletins covering various issues on the MKIII that are available. Contact me for copies.
And, I can provide the proper Wiring Diagram for any MKIII chassis.
Then there is SCOF......
And finally, right here. CC is an amazing resource for questions and answers regarding most any issue you can imagine.
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Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net