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I just got my car at the shop today, they had to remove the intake manifold to replace the evap volume purge control valve. The car drove fine till i got on the freeway, the car started to hesistate, and then seemed like the motor was stumbling. Then my check engine light turned on and was flashing, i immediately pulled over and pulled the code with my scanner, it was a cylinder #4 misfire. I called the shop and they told me to bring it back, so i drove there and my car sounded diffrent and was idling really rough. They told me it was the o rings on the injectors. They reused the same ones, could used o rings cause this problem? The car was running smooth before i took it in.
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Possibly if there was not a good seal for the injector. It would let un-metered air into the cylinder as an example.
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