OK,
I've taken the intake manifold off and unfortunatly, there's absolutly nothing wrong with any of the lifters. Also from what I can see, there's nothing wrong with the camshaft either. The cam is an edelbrock performer plus with an MSD electronic distributor, the gear on both seems fine. Also I have an electric fuel pump
I guess this means it's something deeper in the engine.
I suppose a complete teardown is the only way to go now.
DAMN
