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Car miss. Computer pass, no code. Changed plugs, wires, fuel filter. High idle. on 2000 Pontiac Grand Prix

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Car stored for 6 years. Ran great before. Changed oil, plugs and wires, air, fuel, and oil filters. Computer passes, no codes. Checked all vacuums. Still misses.
(2) Answers
I would start by checking the coils for spark ...just pull the plug wires off one at a time to find out which cyl is missing...what kind of scanner did you use to check for codes if it is just a code reader that wont help much ...you need to use an OBDII scanner so you can get a data stream !
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