Multiple Misfiring cylinders (Random)

I got the Giac 93 octane chip upgrade and now the car runs fine, great, wonderful. Except if I shift early and floor it. In 3rd and 6th if im going to slow and put the gas to the floor like.....80mph then go to 6th gear and floor it or 20mph and get to 3rd and floor it ill get a flashing check engine light. Today I tried to push it through the misfiring by continuing pressing on the gas and the check eng. flashed then registered a code to my ECU, if I didnt stop there would be some serious damage, but after I went back to 5th then up to 6th at 120 no problems all the way to...well, i much higher speed. If im not driving conservativly or flat out gear to gear maxed out redlining it I get misfires on those two gears. Has ANYONE, had these problems? Electrical? Fuel? does it need to be mapped again? anyone thats had similar problems id love to hear from. ive got plenty of ideas, new injectors, new pump, grounding kit, coils, spark plugs. But I would love it if someone has had this problem too. Thanks







2001 Audi S4
ASP 3" DP's
Borla 3" cat-back
Bailey Motorsport Diverters
Samco silicone hoses
RS4 kit
18" ADR M-sport wheels
HP racing full suspension
Giac 93 Oct chip upgrade
UUC short shift
RS4 Grill
Smoked Tail Lights