Hello,

What year is the car? Do you have an OBD port to read codes?

O2 Sensors can affect. I am installing O2 sensors due to misfire code on my V12.

Vacuum leaks could be another issue.

I also checked my plug gaps.

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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S
2001 S600 Daily Driver
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