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DESCRIBE ISSUE....Been having an issue with this code for the past year or so. The first thing I did was replace the spark plugs, figured it can't hurt, they hadn't been replaced in awhile... Still get the code, but nothing specific that seems to cause it (i.e. - wet weather, temps below zero, etc). I just recently replaced all 4 coil packs, but the code came back. I tossed in some seafoam last week, and all was good. Until today!
Next up is to start chasing the individual wires backwards looking for wear or rub spots, or possibly a tiny little crack. I've also noticed comments about possibly a low fuel pressure could cause this, or low compression.
Car has plenty of get up and go, although the wife describes it as "sluggish" at start up - sometimes. It usually starts right up whenever I go out and start it, so not sure what she means. Of course, I get the "look" like I'm supposed to instantly know exactly what she means!
Anyone else run into similar situations, or have any ideas what else to look for? I'm off Sunday, so guess what I'm going to be doing...
A po300 (random misfire) can be tricky to pin point.
I would sure start by getting some comp readings to rule that right out of the way.
So, 4 new coil pack, spark plugs, Idea, have you noticed any oil in the spark plug tubes? You may have an oil leak stemming from the valve cover grommetts that have deteriorated the spark plug boots. That is a very common p0300 issue on these engines.