w168 trying to stall, from or to idling

[W168IAN]

[i]LO AGAIN
TOOK MY LITTLE A160 BACK TO THE USED DEALER I BOUGHT IT FROM ONLY A COUPLE OF WEEKS AGO DUE TO IT CUTTING OUT ON ME AS MENTIONED IN PREVIOUS THREAD, THEY SAY ITS BEEN HOOKED UP TO COMPUTER BUT NO ERRORS ARE LOGGED. WHAT I HAVE FOUND IS WHEN SETTING OFF FROM LIGHTS ETC, THE REVS DROP OFF THE GAUGE AND THEN PICK BACK UP, THIS ALSO HAPPENS WHEN I TAKE MY FOOT OFF THE THROTTLE WHEN COMING TO A HALT. THEY DROP OFF THE GAUGE AND THEN RETURN TO IDLE SPEED.

ANY IDEAS PLZ, IT'S A '99 REG A160 ELEGENCE

CHEERS