Re: low idle and misfiring
Vacuum gauge should be steady, but with a missing cylinder, whether it be a gas problem or ign, the gauge will fluctuate.
When missing and engine is cold, you could use a temp gun and measure each exhaust port. The cold one is the missing cylinder.
If engine is hot, and misses, pull a plug and the wet plug is the dead cylinder. Dirty injector, bad coil, or temp sensor faulty causing the engine to run in 'choke' mode, enriched fuel mixture. This condition will clean up at higher rpms.
Also, with an engine sitting for a good length of time, a lifter could be stuck, but then you would hear a light tap, as in a rocker arm clanking. Low oil pressure or dirty lifter, change oil & filter.
I'm sure the timing marks on the timing chain and sprockets were in correct alignment when you installed them.
As time goes on with engine running, the PCM should relearn engine characteristics and make adjustments as it is driven.
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