I'm planning on having my FPR changed, and probably plugs/wires...

 

Search "seafoam" stuff works wonders on odd motor issues...quick cheap and EXTREMELY effective

 

Got the code read today = P0300 Random misfire

Any ideas on where to start or how to narrow it down?

 

I would definitely check plugs and wires.

 

Do the seafoam treatment, HIGHLY recommended, follow the instructions from the tips on here to do it, then run it for a day, then go get an oil change, on your way home stop and get plugs and wires, make sure the plugs are gapped precisely...and you should have no more issues!

 

I treat it with seafoam regularly, but why the oil treatment? I wouldn't think it has anything to do with that part of the engine.

 

I got the random misfire code once when there was a tiny hole in one of my plug wires where it was too close to the header. I hit a puddle of water and the thing went crazy. Might want to check the wires.

 

also clean the MAF with electrical contact cleaner while your in there updating. a false maf reading at idle will make it do this.

 

same thing was happening to my truck...the longer i stayed at an idle the worse it got and more it bogged as i took off...it was a loose plug wire, i went ahead and replaced all the wires and it cured it.

 

I replaced the plugs and wires and it is doing fine now.