When replacing old parts with new,
note 99% of Factory+Vendor QC Staff are now long gone, so "New" don't mean "TestedGood".
Consider also doing these items:
*
Clean+OhmCheck both the old+new CoilPack with a MultiMeter.
*
OxSensors, renew every 100kMiles\12yrs; they wear out & bias Air+Fuel rich as they age.
*
PCVValve, renew or at least clean, inspect Vac hoses+fittings for cracks+leaks.
* FuelFilter, renew.
* MAFSensor, clean, use MAFCleaner or RubbingAlcohol+CottonSwabs.
* ThrottleBody, clean., use CarbCleaner.
* IACValve, clean., use CarbCleaner.
* EGRValve, clean. use CarbClean
* DPFESensor, clean RiserTubes with CarbCleaner, inspect RiserHoses+SensorBody for heat damage.
* SerpBelt+Tensioner+Pulleys+HarmonicBalancer+Fan, inspect & renew as needed.
* ThermoStat+Housing, inspect & renew as needed; AluminumHousing strongly recommended.
* Battery+Alternator connections, clean+tighten.
* BrakePads+Rotor, renew as needed, suction+refresh Reservoir DOT4
* SteeringReservoir, suction & refill MerconV
* Trans PanDrop + ValveBodyBoltRetorq + new Filter + new PanGasket + new MerconV + BandAdjust
* TransferCase new MerconLV
* Diffs new 75w140.FullSyn+Additive@Rear, 75w90.FullSyn@Front, AmsOil recommended