| Is the brand new PTU a series 2? Do you have a adapter sub-harness? These are known for corrosion in the connectors. Most prefer to solder the adapter harness directly into the EFI harness. 
Series 2 PTU on the right
Adapter harness corrodes in the old rectangle style plugs
 When was the last time it ran properly? After the timing belt job? Since we know it is a single cylinder misfiring, we need to look for proper fuel and spark. A compression test also helps. Can you check that? Swap a coil pack with one of the other good cylinders and see if the misfire follows the coil pack. You can perform a power balance test yourself by unplugging the coil pack connectors one at a time with the engine idling. The bad cylinder will not drop in rpm as much as the others. Which is where the cylinder 2 14rpm drop came from. Conzult or another diagnostic software would go along way in your diagnosis. Especially when it comes to setting the IACV up, checking timing and TPS.
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15:58:19 11/09/15
Good call on the new style injectors - 
