OK guys, small bit of history here. We (me and Steve) were hoping the car could run a few MPH faster at the 2013 1/2-mile event in GA. Last fall, I upgraded to the 61mm pulley to try to improve on what the 65mm pulley had already given me. In order to make the 61mm pulley play nice, we had to upgrade some components.

• Swapped to 550cc Bosch EV14 injectors
• Swapped to Iridium spark plugs, one heat range colder
• Installed Magnecor wires

The plugs/wires weren't mandatory, just recommended by several sources on the forum (had more than one person recommend that I use the "one heat range colder" plugs since my motor was significantly over the stock numbers).

The Magnecor wires were a fail. I couldn't keep them connected to save my life. You'd be driving down the interstate, feel a misfire, pull over and one would be unplugged.

So, I swapped back to OEM wires. They stayed connected, but I continued to have problems with the car misfiring, but ONLY under the following conditions:

• 20 minutes of highway speeds when the temp is >70° ambient
• 30 minutes of stop/go traffic when the temp is >70° ambient

By the time I had begun to get SEVERELY annoyed with the issue, we hit December. And as luck would have it, I could NEVER replicate the issue during the winter. The car ran flawlessly. Like, you could drive to California and never worry once.

The fix is alarmingly simple -- pull over, pop the hood, and wait ten minutes. The longer you wait, the further you'll go once you start back up.

But, on the fist day the temp exceeded 70° ambient (back in late March), the issue returned. Each time, it was the same thing -- you'd feel a "cough" in the pedal, then you'd feel the misfire, then you'd get the blinking CEL, and if you didn't stop QUICKLY then you'd eventually lose all cylinders. Each time, the codes were the same -- P0300, P0302, P0305. If the issue happened when I couldn't immediately pull over, then additional cylinders would fall offline.

So... pop the hood, wait a bit, shut hood, clear codes, and continue.

It's safe to say, I haven't taken any long journeys in my car.

Since then, I've replaced the following (to no avail):

• Replaced CPS just to be safe (even though I never got P0335)
• Replaced all 6 (six) coil packs

So at this point, I'm at my wit's end. I can confirm that the car had ZERO issues until we changed to the new injectors and plugs. Wires are back to stock, so we can rule those out. I have a new CPS, new coil packs (all six cylinders), so we know those are good.

The only thing Kim can think of, is the plugs (retrace steps to last item changed before malfunction). The failures started happening right after the weekend we changed plugs.

Could this POSSIBLY be the spark plugs "overheating"?!?!? This sounds like complete nonsense to me -- plugs either work, or they don't -- right?!? I can't fathom the ambient temperature making a difference to a plug that's exposed to fire within the combustion chamber.

I checked RCM joints and they look fine. All wires are connected firmly. New CPS is installed.

I appreciate any insight you guys can offer. I just want this thing fixed (and sold) so I can move on and start the new chapter. But I refuse to sell it until I know for certain the issue is remedied.

Thank you all,