Adjust your C/O to 3.5 to 4 o/o at the header pipe and if you check it at the tail pipe adjust it to 2.5 to 3 o/o, after you adjust the C/O get them to do a TPS reset if this is all done correctly and you still have the flat spot it could be a faulty TPS (but unlikly) or you may need to have your injector cleaned.
No differant than a jet in a carby that can get dirt in it.
To do the adjustments you need to have the VDSTS diognostic tool that will work with an ECU of the type of the Gas Gas I think it is a IAW15P.
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