To the OP, I have the exact same issue that you are describing. Rough idle and a "surging" or "lurching" when leaving from a stop and my foot releases the brake pedal. I have low compression on cylinder #6 (about 92 psi, to be exact). Also did a leak down test and found about 60% leakage as...
Is the oil cooler in the Police Interceptors different from the standard SHO's? Is there a difference between the 10-12 and 13+ oil coolers?
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