If your VAZ (Vesta, X-ray) engine is misfiring, first check the ignition coils and spark plugs.
They can be easily replaced yourself.
Engine error codes 1302, 1301, etc. are exactly this :)
Coils for purchase have part numbers:
21120370501012
21120370501013
21120370501015
Spark plugs I installed:
NGK BCPR6E11