1999 Chevy Express won't start?

Gerardo

New member
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!!!!
 
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