Here we go again!!

90 LS. automatic. new fuel filter, spark plugs, oil, replaced MFR. car turns on fine when cold. get to your destination and turn it off and 5 minutes later when you go to start it it starts and dies instantly and when you try to restart it, it just cranks and cranks and the s3 light is flashing and check engine light stays on. let it sit for a few a couple minutes and you try again. this time the s3 light and CEL turn off. you start it and this time hit the gas. get it reved up to 3000 rpm and let it drop down and now the car stays on. any ideas as to what the problem may be will be appreciated.

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