ian ordway

having a prob with cyclinders 5 and 7 it dosent seem that there fireing the headers are cold to the touch checked for spark and checked the fuel injectors and im sure that there is no vacumme leak im starting to run out of ideas can anyone help

thunderstruck

iTrader: (15)

i had a very similar problem on the dyno, turns out i had two severely bent push rods, might check those

Lt1Porsche

iTrader: (6)

If you are sure that you have spark and fuel. If you are sure that your fuel injectors are firing and that your spark plugs are in good condition. You need to pull the valve cover.