So, recently (a month before I'm ready to sell) my Z has been acting up.

About a week ago, I noticed a slight hesitation to accelerate between 2k-3krpm along with a soft code, followed by a hard code. Literally 3 minutes after the hard code came on, I got the code read. Misfire Cylinder 4.

Swap the coil pack to Cyl. 2 and Plug to Cyl. 6. A good ammount of oil in Cyl. 6. Figured maybe the plug was loose since no other cylinders has a ton of oil.

Ran great until tonight. A soft code along with the hesitation again on the way home. Went to drop a friend off, after about 30 miles VDC and Slip light come on, along with a randomly timed power cut (like when VDC comes in when you lose traction with VDC enabled). Shortly after, a hard code (but no hesitation between 2-3krpm). When I pulled into my driveway and put the car in neutral, it shut off.

Oil pressure and temp is normal. I know the car was FI'd 3 years ago and was reading weird AF ratios before it was parted out.

Please help

 

I'm no expert BUT....maybe seals on valve covers allowing oil to foul plugs?!?

Common issue but not sure about codes.

 

Update:

Got the code read. Throttle Position Sensor.

I did some research and learned that the VDC/SLIP issue is a fail safe mode which sometimes which activates when brake pads are worn. Checked brake pads, totally worn. Replaced those, no more fail safe mode (for the last 50 miles at least)

I noticed the clip which connects the 'sockets' on the coil packs is broken and doesn't fully clip on cylinder 4. I zip-tied them tightly together and that seemed to help seeing as my code wasn't misfire anymore.

Is there any way the misfire and TPS failure are related? I'm starting to think its just an electrical issue, or maybe all these things are just going bad at once.

 

The misfire was in cylinder 4, which was dry :/ cylinder 6 had all the oil.