Remove your distributor cap so you can see the rotor. Get a breaker bar & find a socket the right size for the harmonic balancer bolt inside the crank pulley. Rotate engine just until you see the rotor end move. Then change directions, if you can turn the engine several degrees before the rotor starts to swing back, your timing chain and / or pulleys have worn to excess.
Best 1st move to make IF you KNOW that motor has many miles on it, OR even if you don't.
A true roller chain/gear would have to wear alot before skipping. Those plastic coated teeth gears, not so much.
When those plastic pcs. break off the gears, they usually fall into the oil pan.
Drain some oil & see what's there.
