ITS THE COMMON CHEVY 6 PROBLEM, ITS A LEAKING INTAKE MANIFOLD GASKET. TAKE SOME STARTING FLUID AND SPRAY WHERE INTAKE BOLTS TO CYL. HEAD AND IT WILL REV UP. TRY IT................
Previous owner replaced the intake gaskets and my spray tests and the vacuum gauge says no leak. And what was said above about 5 & 6 sharing an intake runner.
I need to have a close look again at the distributor . These engines are known to experience worn distributor shaft bushing that affects dwell...
