2005 silverado po300 random misfire
I have a 2005 silverado with diablo sport predator, k&n intake,and pacesetter shorty headers. Started to misfire after instaling the headers and thought it was just an exhaust leak but fixed the leaks and it still miss fires. Took it to a mechanic and he checked all vacum hoses and intake gasket but still no problem. He says from his experience it may be a broke valve spring, lifter, cam, or injectors. He also says that cylinders 1 and 8 are the ones misfiring and the miss fire together. Any ideas on what it could be would be greatly appreciated.