Spark plug wires

check for spark in cylinders 1 and 4 if none, replace coil pack. If spark is present replace spark plugs in cylinder 1 and 4

IF IT IS FUEL INFECTED YOU NEED TO CHECK FOR FIRE TO YOUR INJECTOR WITH A NOID

remove and clean the injectors
misfires are more injector problems than wires and plugs

could also be a bad coil or ignition wire

• 16706 P0322 Ign./distributor Eng. Speed Inp. Circ No signal
• 16687 P0303 Cyl. 3 Misfire Detected
  
• 16806 P0422 Main Catalyst, Bank 1 Below Threshold

P0322 Could be caused by a faulty Engine Speed Sensor also known as a Crankshaft Pos./Engine Speed Sensor.

P0303 Might have a faulty #3 Fuel Injector, Faulty spark plug and/or faulty spark plug wire and connectors.

P0422 Either your front 02 sensor is faulty and/or your catalytic converter is fried and needs replacing.

Possible causes for a misfire:
Spark plug
Spark plug wires
Weak or bad coil
Dirty or a bad fuel injector
Low compression in cylinder
This is a case of testing and process of elimination. Have them all tested to find out which one is the culprit. Change the plug and wire to a different cylinder, if the misfire happens in that cylinder, you'll know it's either the plug or the wire. Without doing any testing, it's hard to say what the cause is.

It sounds as if you posibly got some faulty new spark plugs or wires. It happens more than you might think. If you know anyone that owns a repair shop have them put it on a diagnostis computer and it will tell you what is causing the misfire and which spark plug is faulty if that is what it is.

change spark plug wires and check corrosion in the distributor coil

I would change the following in this order if your are tight on money...if not you could have it done all at once.

1. Change Spark plugs (most likely cause of the misfire)
2. Change Spark plug wires
3. Change Rotor Button (this is inside the distributor cap)

All three are fairly easy processes. I would try this first before giving up on the engine. Hope this helps.

good luck i have the same car and it has been a nightmare from day one . everything is expensive to repair mine showed a mis fire in same cylinder had to supposedle head gasket was bad and gas was gettting in causing misfire