I have a 232/238 575/585 114lsa. Stage II heads that have been milled .030 and LT's. The SES flashes sometimes and not others. The code it keeps throwing is P0300 Random/Multiple misfires, but I cannot feel it, even when it's flashing. There is never any hesitation and no noticeable surge. I have checked the wires and see no problems. I'v tried to find info on the site but cannot find any situations like mine.

Can this be a false code?
What else can I check?
Can the PCM values be raised?

Thanks!

 

Has the car been tuned? Its almost a guarantee that its going to throw that code once a large cam is installed. A good tune will take car of it. If it has, have you checked the plugs, injectors, or the 02 sensors, wiring off the coil packs etc?

 

It was a mail order tune. I have checked the stuff you mentioned. It is probably the program, it's done it since I got the tune back.

Thanks,
Nice lookin' Z

 

I've had that code also and I have a bigger cam than you do. I get it once or twice a month. I've had mine tuned by a guy locally, but I dont worry about it.

Have you had any other check engine lights? I get a system too lean code, and I also get sometimes a code dealing with the EVAP system (says theres a small leak) never got this code before the cam.

I wouldn't worry about it though. Just clear it whenever it comes on.

 

looks small....

 

there is a sticky regarding this. which you need to set the mis-fire detection settings so it will not throw the code. easy fix