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2013 2ltr no load miss fire ..?...cold start.. engine runs smoothly, when it warms up you notice a roughness in park, in drive the shake isn't as noticeable... no code lights ..the car runs fine even under hard acceleration...checked plugs all looked ok.. burn color fine normal electrode tip color all the same ..no oil deposits installed new plugs anyway 83K on them... no change... seems like cyl 3 or 4 the culprets changed /switched coil 1 to coil 3& 4 position no change dealerships service advisor said no warning light don't worry...bring it back when a light comes on... I'm a old 2 stroke engine mechanic... I know enough to make me dangerous I tried to spray carb cleaner to see if a air leak showed up... too much "stuff" to get at intake track very well... any suggestion will be appreciated... Is this where a good " obd" scanner would reveal the problem area ?
 

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1, Is PCV clean?
2. What is battery voltage at idle?
3. Any vacuum hose cracked?
4. Coil primary connections secure, sockets fully seated in connectors?
5. Fuel injectors checked/serviced?...especially if most miles low speed/start-stop.
6. How often is Soul driven long distances at higher speeds?
7. O2 sensors connections checked?
 
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