I have a 1999 Chevy Express 1/2 ton van, 5.0L.
Will not start.
Has good fuel pressure.
has a weak spark... changed the ignition module, distributer, cables, spark plugs, crankshaft and camshaft position sensors, and ignition coil.
After changing all of that it still won't start has a yellow spark.
Whats wrong with it? Ideas Please!!!!