In your first post you mentioned:
-New Caps, rotors and plug wires and plugs (all Bosch)

Your Last post:
-New caps, rotors plugs and plug wires within the past year (8,9,10 months?, 5,10, 15, 20K Miles ago?)


This is what I would do:

1.- Check the codes (if not checked, or do it again) and post the results

2.- Remove distributor cap and rotor and inspect them (look for residue, cracking, splitting, pitting, dirt, etc...). Replace again if necessary.

3.- Remove Spark Plugs and inspect them

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
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