Misfire on #2 cylinder reading code 1320

Question edited for clarity.
Question moved from 'Speed Computers', to Pontiac G5.

The way to find which item is faulty is easy.

Clear the code

Move the plug from cylinder 2 and put it in cylinder 4. Run the car. Is the misfire still on 2 or has it moved to 4. Yes? the plug is faulty. No? Next test.

Clear the code
Move the coil pack from cylinder 2 and put it in cylinder 4. Run the car. Is the misfire still on 2 or has it moved to 4. Yes? the coil pack is faulty. No? Next test.

Same test for the injector.

If the misfire remains on 2 you need an auto-electrician with a pro grade scan tool computer which analyses every sensor and every module.

My info says you don't have a coil pack. You have coil on plug ignition, one coil for each spark plug. If you have a misfire on a particular cylinder, your trouble code should tell you which cylinder, then you check fuel--spark--compression on that cylinder. A p0300 misfire code is a misfire common to all cylinders, or the computer thinks there is a misfire but can't tell which cylinder.

P0300 multiple misfire
P0302 misfire cylinder 2
P0306 misfire cylinder 6

Try swapping the coil packs around - like swap #1 with #2, and swap #6 with #5, see if the misfires MOVE with the coil packs swapped to the new cylinders or if they stay with the cylinders. If they move with the coil packs, the new coil packs are bad. If they stay with the cylinders, there's a problem with those cylinders. You DID replace that camshaft sensor, right?

Have you checked your #1 and #6 injectors?

if coil packs are ok. change the spark plugs.

Thats exactly what it sounds like.

If there is a misfire, the cylinder that it is misfiring in will be recorded as a code in the computer.

Have the car scanned to determine which cylinder is bad. Then, replace the coil pack going to that cylinder.

Ignition Coil Pack Removal & Installation 2V Engine To Remove:

1. Twist the spark plug wires off of the ignition coil towers. Mark the spark plug wire positions so they can be installed in their original positions.
2. Disconnect the electrical connector from the ignition coil. CAUTION
   When removing the spark plug wires, a slight twisting motion will break the seal and ease removal.
   
   
   
3. Remove the mounting screws and remove the ignition coil.

To Install:

1. Position the ignition coil pack on engine.
2. Install mounting screws and torque to 53 in-lbs. (6 Nm).
   
   
3. Connect ignition coil pack electrical connector.
4. Match previously marked spark plug wires to ignition coil and install.

4V Engine To Remove:

1. Remove the RH cowl grille
   
2. Remove the screws and the water shield
3. Mark spark plug wire positions
4. Disconnect the spark plug wires from the ignition coil CAUTION
   When removing the spark plug wires a slight twisting motion will break the seal and ease removal.
   
5. Disconnect the ignition coil electrical connector
   
   
6. Remove the mounting screws and remove the ignition coil

To Install:

1. Position ignition coil pack. Install mounting screws and torque to 56 in-lbs. (6Nm)
   
   
   
2. Connect ignition coil pack electrical connector
3. Match previously marked spark plug wires to ignition coil and install
4. Position water shield and install screws
5. Install RH cowl panel

First step is new plugs. It's possible that you have a fouled #1 plug. If that doesn't work, check spark wires (if the car is so equipped) or if it has direct coil-on-plug ignition, where each cylinder has a coil pack on top of the plug, swap the coil packs between cylinders 1 and 2. Clear the code, run the car, and rescan the computer. If the code moves to indicate cylinder 2 misfiring, then your coil pack needs to be replaced.

did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

PO302 is being a misfire, could mean the plug is bad or the coil is bad for that cylinder. Which can give you the misfire reading and the system to lean codes. Check the #2 coil for firing.