idle problem

HOW DO I GIVE MY MARK VII A TUNE UP?
AIR
Air Filter - $3.00 to $42.00

FUEL
Fuel Filter - $5.00 to $11.00

SPARK
Battery - $82.00 to $102.00
Distributor Cap - $6.00 to $28.00
Distributor Rotor - $2.00 to $6.00
Ignition Coil - $14.00 to $52.00
Ignition Control Module - $37.00 to $90.00
Spark Plugs - $16.00 to $120.00
Spark Plug Wires - $13.00 to $43.00
Voltage Regulator - $11.00 to $50.00

Total Cost For Parts - $189.00 to $544.00
 
weird thing is it dies when put into park.
That should completely disengage the torque converter, and improve idle (compared to Drive).
Doesn't say what happens in neutral. Lots more info would be helpful.

Does seem transmission related but can't think of anything Park does that might slow idle speed.
 

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