3.0L V6 rough idle, have codes and a bunch of parts, what next???

[mellinger21]

Ok i have a 2005 Ford Ranger Edge 3.0L V6. It currently has the codes-

P0300
P0306
P0316

showing up. I know they all show a misfire. I have replaced plugs, wires, coil pack, and IAC. Where do I need to go next???

Thanks for the help

 

[Ranger44]

CPS

How many miles is on the truck? Any chirping noises?

A bad CPS going bad will cause a misfire problem. The computer uses the CPS for the firing of fuel injectors on a SFI system.

 

[mellinger21]

its got 116000 on it and I dont hear any chirping noises. Also i forgot to put this in the original post, but it only does this when it is at idle- first crank, stop light, etc. Oh i also forgot to say that it has had multiple treatments with lucas, chevron everything i could find to clean the injectors even went in and replaced all the injectors on the drivers side.

Any ideas????