My Blazer keeps Stalling

My 1996 Blazer 194,000kms, stalls after one hour drive, usually when I'm going at a slow speed like 40kms an hour, I had my MAF cleaned, new fuel filter. Some one mentioned my ignition coil? or some type of coil inside my distributor cap? Anyone know? or have suggestions?

First check for loss of spark or fuel when it stalls or both and post back what one.
A good way to watch for loss of fuel is to tape a fuel pressure gauge to mirrow or windshield.
MT