P1399 Random misfire
Since you are doing the sparkplugs and wire, take a look inside the distributor , there is a distributor rotor , these rotor tends to rotate out of position , and in doing so. the spark timing is off, which results in low power , slow acceleration. That one area that should be looked into due to the low power, If the problem is there the timing belt should be looked into.
Timing belt may have to be looked into, and being in proper timing.
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