please help , i've been all over this thing and i think i may be missing something simple but i have replaced the injector and pcm because after you drive this and start to coast down hill #3 injetor pulse just falls out and will not come back until you shut the engine off and restart it and then it will just keep repeating this . any ideas ?

 

Did you just replace the injector or all injectors??

 

i replaced all injectors because i had a new set here also i replaced pcm to see if it was just shutting off the driver ckt on it's own because this vehicle runs great until the injector pulse falls out

 

any updates on this? i have the same problem but cylinder #1 or p0301 . since this problem arose i have replaced the CPS, coil pack, and spark plugs.

 

another common problem that shows P0300 Misfire codes is a vacuum leaK.

 

bump please someone help lol