at high speeds RPM is jumping?????

[A4UDIRULES]

I got 1.8t cvt with mtm chip and injectors. Recently i was racing with subaru s and type R and at high speeds 200- 240 km/h my rpm started jumping. I had my gearbox in sports mode i switched it to manual same problem. Normal driving there is no problem. Any idea what could be the cause of this?

[eurogruppe]

if you had a manual id say your clutch is slipping, but im not familiar with the cvt

[dirtybrd]

Sounds like you may have a misfire.

[A4UDIRULES]

Sounds like you may have a misfire.

i have just recently changed my coilpacks and spark plugs. What else can cause the misfire? During normal driving all good only when i go 200-240 for sometime this starts happening.