strange screeching noise when cold and holds back in 1.2.3

[gjseb16]

Evening guys

Went to my car earlier hadn't been started all day went for a run when cold seems to hold back but have also started to here like screeching noise from the engine like it being starved off some thing just had a complete fullservice and new fuel filter it's annoying because when warm does not hold back or no screeching sound any ideas had it scan no fault codes odd

thanks in advance Gordon

[Scottymon]

Car will hold back when cold to protect itself.

Screeching; what condition is the AUX belt / tensioner / Alternator pulley in?  You can self test the Alternator pulley, by using an open ended spanner on the tensioner, pull towards the front of the car, place allen key into lockout... (ideally battery should be discconected for next step)... place thin screwdriver into alternator to stop blades turning and then turn pulley backwards and forwards, it should lock on way and freewheel the other... if it's locking both ways or freewheeling both ways it's goosed... £30 part and £10 belt.

[gjseb16]

Checked belt looks okay think I am going to get it booked in to be checked