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Re: 99' crown vic, Vibrations?
If the department never had the plastic coolant crossover fail, it's likely still the plastic crossover. It is not free, you will have to pay for a new one so it's up to you. I just switched mine last summer to one with the aluminum crossover but had no indication if imminent failure on the old one at 95k+ miles.
But regarding your issue, get codes read. If any come up, tackle those. If not, clean your MAF, check for vacuum leaks, and check the plugs and COPs. Don't worry about stripping the threads. Just be sure to torque them down to only 16 ft-lbs of torque with NO anti-seize or oil on the threads.
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2000 Mercury Grand Marquis LS - 119k / 14.89s @ 92.11MPH [ pictures | videos ]
> Dual Flowmaster Delta 40s / J-Mod / PI Intake Manifold & Cams / Marauder Air Box & 80mm MAF / 3.55 Trac-Lok
> Bumper Tuck / Steeda UD Pulleys / CVPI Zip Tube / Ported & Polished Plenum / BBK 70mm TB
> BOC 93 Octane Tune / Headlight Relay Upgrade / 17mm rear stabilizer bar / Heinous Aluminum Billet Rear Control Arms
> CVPI aluminum driveshaft
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