What does jumped timing mean?
A timing chain or belt is worn so sloppy that it jumps a tooth on the sprockets creating loss of power and performance, jumping more than a tooth would render the engine inoperable and in some cases destroy the engine in an interference engine.
Your question is too vague usually when someone says that their engine has jumped time that means that the timing chain has jumped on the timing sprockets. If that is the case you would need to change them. If the distributor is out of time to do it right you would need to have a timing light. You would need a repair manual for the specifications to fix both of them.
The only reason the timing would have jumped is if the belt has lost some teeth which it will do right before it breaks. The timing belt should be replaced before the car is driven or the motor started again. If the belt breaks while the engine is running, it can cause major damage to the head and possibly the block.
Chevy caprice estate 350 v8 that violently backfired and died How do you set the timing on this engine?
Sounds like your timing chain might have jumped a notch. Timing is set by rotating the distributor. There is a nut underneath the distributor that locks it down. Timing mark is on the harmonic balancer, sorry I don't have the setting handy. I would start by checking the timing with a timing light. VBdenny