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I think I figured it out. Today the spark plug on cylinder 3 shot out and tore off the bolt holding the coil pack. It probably wasn't torqued correctly and finally came loose enough to be ejected. Checked the rest and they were correctly torqued. Threading was still good, screwed it back on...

Does the fact it takes a day or two of driving for the light to go on mean anything? Also the light never flashes, it always goes on solid.

P0303 went on again. I'll move the coil pack tomorrow and see if it follows it or not. Thanks for the help and ill update you on the results

I removed the wire harness to the injector in cylinder 3. The slight ticking didn't go away or get worse. What does that mean? Also, no light was on but the computer had thrown P0353 code. Maybe the coil pack I replaced was defective. Ill reset and see if it comes up again before I return it...

But wouldn't that throw its own sensor? My fuel trims are a little heavy on the lean side, but equal on both banks. Long fuel trim is usually running 8-9% lean on both banks, short fuel trim is at 0% plus or minus 1-1.5%. Would it this help rule out or indicate 02 sensor problem?

I have a 2006 mustang gt with 125k miles on it. In Jan it threw a random misfire code P0300, so I changed out all 8 of the spark plugs. I thought it was bout time. About a month ago I threw a P0301 so I replaced the coil pack, which appeared burnt on the coil end, on cylinder 1. Seemed to fix...