Busy couple of weekends:
I think it was two weekends ago when I started troubleshooting the occasional P0301 misfire.
Pulled, checked, and adjusted the cylinder 1 plug. I
think it looked fine? I look at charts of these and think this looks normal-ish.
Got pissed at how difficult it was to reattach the coil connector. The rubber seal inside the connector was breaking down and made it damn near impossible to fully connect and lock. I got it connected, but needed to use the handles on a pair of pliers so both hands could push the thing home enough to lock. Total PITA.
Undid the air handler on the throttle, fired up the engine, and sprayed the intake with Gumout carb/choke cleaner. I sprayed about half a can total, some at idle and some at about 2000 RPMs. Exhaust stank in the process.
Then I added some Redline SI-1 to the fuel. I could hear all injectors firing. So I decided to try the easy cleaning method on them before I pull them. I also reset the PCM and ran the vehicle through the week. Significant felt improvement on acceleration, much easier/quicker to get up and over 3000 RPMs. My scanner currently shows no codes, all monitored components are green.
While going through all the above I heard a whistle from the rear CCV elbow where it sits in its grommet. While spraying the throttle intake, I bumped the hose going to the intake manifold, it bumped the rear PCV elbow and it started whistling. The front grommet was solidified. Might as well replace those, right?
Last weekend I replaced both valve cover grommets and the front elbow (I busted it trying to remove it). The hose from airbox to elbow was dry and beginning to crack. It was then replaced. The rear elbow came out without incident. I cleaned it and reused it in the new grommet. Maybe some improvement?
Today I installed a Toyota harness for my H4 Hellas. I used the nuts connecting the battery terminals to the wire harness ends as the harness connection points. Easy installation on the rest, routed excess wiring ahead of the radiator on the lower grill channel.
Then I disassembled and de-pinned a coil connector pigtail (Standard Motor Products) to swap it with the PITA original.
Dissembled the one on the vehicle, and then put it back together with the replacement connector.
Now it attaches and locks with light pressure.
Reinstalled and reconnected the battery, fires right up and all my lights work. It was a good day.