Hook up a fuel pressure gauge an see if you are not loosing fuel pressure causing this running problem. Hook it up to the fuel rail with a long enough hose to locate the gauge where you can watch it while you are driving. If you are loosing pressure then check for fuel resistance in the line, fuel pressure regulator or fuel pump going bad.
SOURCE: 99 Chevy Blazer
Have you tested the crank sensor? sounds like no command from PCM to pulse injectors.
SOURCE: Reduced power below 4000 RPM
The main relay also controls the transmission and will cause an intermittent interruption of power and indicates its going bad. about a $60.00 replacement cost. the relay is located under left side of dash.
SOURCE: 1999 Chevy Cavalier Z24 2.4L cooling fan inoperative
yes you could have a bad ECT or the relay could be bad it sounds more like the relay is heating up and kicking out
SOURCE: 1999 Chevy Blazer won't start in cold weather?
sounds like spider injectors there like $450 alone mine did that last winter looking at easy 700 to fix
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