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It may be that the pistons have hit the valves because of incorrect timing. Damaged valves will result in no compression.. This will happen on an interference engine - valves hit pistons. I don't think your car is an interference fit engine, so it may be -hopefuly - a case of incorrect timing.
The link below lists all interference engines:
Is there zero compression on 1 cylinder or all cylinders?
Either worn valve guides, valve guide oil seals on that particular cylinder, or worn piston rings. You need to perform a compression test to find out which one of these it is.
Compression check each cylinder with all plugs removed. Take notes on which cylinder has the weakest compression.
If no compression difference and if all operating within range, then change the valve guide oil seals on problematic cylinder.
If the cylinder shows a significant drop in compression, then drop no more than five or six drops of oil down the plug hole of the problematic cylinder, and perform the compression test again. The oil will temporarily seal any worn piston rings, so the pressure should rise when retesting if the rings are worn. If the pressure remains low, then your valves are not sealing properly and require attention.
If your losing compression then I suggest doing a compression test and then following it up with a wet compression test to determine whether the problem is in the valves or pistons.
Wow one tune up in 122k miles jerking not really an ignition thing more like a fuel thing. If Compression test results are good then do a full tune up even replace coil packs or distributor ( which ever is applicable) and replace fuel filter.
These vehicles are not known for major engine problems (blown engines bad valves etc).
Big with transmission problems if its a 6 cylinder not the 4 cylinders.