Hi all RRs :-)

Can somebody help me?
I have problem with RPM (you can see on video).
If i turn RMP up to 5500 everything is ok...but if i turn 5000 and less, so RPM is declining wery slow.I already checked intake valves,and lokks ok.
Time to time i have also problem, that during ride (up to 10 000 rpm) indicator lights FI.I have to stop engine,start again and indicator FI is out.

Thanks for help :-)

Martin