I have a 2001 durango 4.7L I pulled the motor an completely rebuilt it cause it spun number 8 rod bearing put it back in now I'm having trouble with it missing between 800 an 1000 RPMs but some times it will idle just fine an if I get it above 1100 RPMs it's fine it gives codes but every time it's different coil packs. Could it be fuel related too? I need help!!!