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First, are you positive the problem is a misfire or is it simply running poorly and hesitating?
If it is simply hesitating or running poorly here are some areas to check out.
1. Check the ignition system (adjust if possible or replace necessary parts).
2. Check for bad/restricted fuel injectors and fix/replace if necessary.
3. Check the fuel delivery system by checking the fuel pressure with a pressure gauge. The most common problem is a bad fuel filter which is a cheap and easy fix. The problem may however be a restriction in the fuel line or even the fuel pump (although this is very uncommon in a Vigor).
4. Check the operation of the engine management system.
If it really is a misfire, check your spark plugs and spark plug wires as well as the ignition/ignition wires.
Good Luck
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