Yamaha 4 stroke 1995 50hp wont idle.....Help please

[yamaha84]

Hi my yamaha 50hp 1995 4 stroke outboad is recently been set up on my boat and re fitted all New cables and now it wont idle, it starts and all works fine lo vely engine, ticks over lovely but when i take it out of gear the engine rpms go sky high obviously where i ave not adjusted something properly but the cable ends are now on full adjustment and it stilll wont return to idle when coming out of gear.

any advice welcomed & appreciated Thanks