Belt is loose and slipping
The belt is slipping.
a loose or slipping belt
The most likely cause is the fan belt is slipping
The most common cause is slipping belt
you probly have a belt slipping, a can of belt dressing should stop the sound
Fan belt slipping?
Power steering belt slipping?
I is possible. It may just mean you need to tighten your belt. Your car should have a belt tensioner which you can use to tighten the belt until the stops slipping or buy a new one. Newer ones always have better traction.
The timing marks were probably not set right when the timing chain was changed. This will cause the timing to be off and can result in backfiring and loss of power.
It sounds like the fan-belt is slipping.
The timing may be off. If the timing belt is old then the gears can slip and cause backfiring, or the engine to not run at all.