DID YOU TRY RESETTING THE NEEDLES BACK TO 1 1/2 TURNS OUT?
AND WHEN YOU MAKE YOUR ADJUSTMENT ON THE NEEDLES YOU ONLY TURN THEM 1/8 OF A TURN.

I KNOW YOUR NOT SUPOSE TO DO IT BUT I TURN MINE WITH THE ENGINE RUNNING SO I CAN HEAR THE SOUND
OF THE ENGINE AS I TURN THE NEEDLE

ONCE IT IS STARTED I PUT THE THROTTLE ALL THE WAY UP AND ADJUST THE HIGH NEEDLE TILL I HEAR WHAT I LIKE
OR WHEN THE RPMS ARE WHERE THERE SUPOSE TO BE.I TURN ONE WAY IF SOUNDS BAD I GO THE OTHER
THEN I BRING THE THROTTLE BACK DOWN AND CHECK THE TRANSITON FROM LOW THROTTLE TO HIGH
BY MOVING THE THROTTLE QUICKLY FROM LOW TO HIGH TO SEE IF THE ENGINE WILL CUT OUT.

IF IT CUTS OUT I ADJUST THE LOW NEEDLE UNTIL IT STOPS DOING THAT.

I AM FAR FROM BEING AN EXPERT BUT THAT IS WHAT WORKS FOR ME.

ALSO YOU CAN CHEK YOUR DIAPHRAMS AND SEE IF THERE AL IN GOOD CONDITION