Moaky84

P0300 random misfire. i installed the lower intake gasket and got a p1345 timing off. I brought it to the shop to set the cam retard with a scanner. Now I'm getting the random misfire p0300. 1,3,4,8, are getting fuel to the injectors. They are firing but when I disconnect it doesn't make a difference to the rough idle. What would cause all four injectors to stop getting fuel. Electrical? How can I find it/fix it? Or maybe something with the spider injector not working. I was going the take the upper I take cover off the inspect the injectors. Any ideas?

Moaky84

I was able to diagnose by finding www.easyautodiagnotics.com the spark was at all 8 plugs and distributor cap. The whole spider fuel injector was shot mainly the fuel pressure regulator. I found out the fuel pressure regulator goes out often in these trucks. It was all charred black I replaced the assembly with the mti conversion kit and it fired up without any hesitation.

73shark

Thanks for reporting back your solution. Makes the forum work as it seems to be a common problem and will help someone else in the future.