Originally Posted by AIRaquarian

I have found the problem to be the ignition coil which resides inside the distributor. They say it is a non serviceable part but that is incorrect. You can purchase from any major parts store. Prices range from $35 (Pep boys online) to $135 (NAPA brick and mortar). Here is a pic: https://images.oreillyauto.com/parts...99_primary.jpg

I have gone through this 3 times now on my 99 jxi - believe me I know the frustration. Remember there are only 2 conditions which will cause the ASD: improper camshaft signal to the PCM OR improper crankshaft signal to the PCM. One of those is inside the distributor - but that isn't the problem. The coil is the actual problem. You can check primary coil resistance on the 2 pin connector - it should be between .6 - .8 ohm. Also check the secondary coil resistance by checking the resistance between the high voltage terminal and connector terminal 11 of the 2 pin connector. Value should be 12 - 18 k Ohm