hey guys ive searched everywhere. ive done my plenum, gutted my cat. new plugs wired cap and rotor. i replaced the vac hose that goes to the pcv valve as it was cracked. and the misfire still persists. its on both banks. cyl's 1, 4, and 7. cant remember if there are others cyl's. there is also the p0300 code which is multiple misfire code. my coil is also brand new. im at a loss and its driving me nuts. im going on 3 months past my inspection date. and i dont feel l ike getting a ticket. any help would be appreciated!

 

Did you route the wires per TSB?

 

yes, except for the coil wire. but i dont see that causing the problem.....

 

Just checking. That's all I can come up with off the top of my head right now. I didn't do mine the the TSB, but I used Summits 8.5mm wires. Haven't had a problem. What brand and size wires did you use?

 

i used the autolite ones from advance. they have wire loom on them and everything. think they are 7, or 7.5mm.

 

Best I can do is give you a short list of what I have done to chase down a miss.

1 Clean the fuel injectors, rails.
2 Clean or change the fuel filter/reg on top of the fuel pump, (I found lots of dirt & water in mine).
3 Change the temp sensor for the pcm(this was my final problem and it was a fluke that I found it).

 

In my personal opinion, I'd throw those Autolites as far as you can from the truck and make sure you don't hit any other of your vehicles with them or they could run like sh*t also. I've never had anything good with happen Autolite wires.

 

I would suggest routing all wires per the TSB. Coil wire may be creating problem so I would route it accordingly. Better to be sure.

 

well the temp sensor is only 20 bucks but probly a good bit less when put under my cash account at advance. gonna look into some msd 8.5's or taylor 8.2's for wires. gonna also get the brass cap and rotor as i just went with what advance had on the shelf. i dont think my heads are cracked, but could that be a cause of a misfire?

 

If you're looking at replacing everything might look at this kit. This is the one I got. Has the brass terminals. Oh, and I screwed up, the wires are 8mm not 8.5.

http://www.summitracing.com/parts/SUM-867815CR/