I have a 2000 mustang gt (automatic) with a chip and a steeda 4.6L timing adjuster. When i am going about 35mph my car will upshift when i take my foot off the gas and then when i give it gas it sputters and sounds like it is in to high of a gear which it is and then downshifts and is fine. would my timing adjuster or chip have anything to do with this.. Does anyone know how to fix this?