THE key stop working in my 2001 siverado so I pop the ing swi h with a screwdiver.now will only start for a few seconds n dies

SOURCE: Stalls and dies

Sounds like it could be the throttle position sensor.

SOURCE: 2001 cavalier barely starts,sometimes runs

Three things.
First, you need to check the MAF sensor for contamination.

Second, check fuel pressure, if you dont have a gauge, autozone and Advance have them on their tool loaner program.
Should see 35-40 psi with key on engine off, cycle key a few times, if it takes a while to build up, replace filter and retest.

Third, possible convertor blockage, easiest check is to remove the 02 sensor and try to start with the hole open, if it runs, then that is it, specs allow for 2-3 lbs of back pressure max. That means if you can hear pressure escaping, it is a problem area.

SOURCE: Key just stop working

take that key to your dealer and make another key made for it or check and see if your key will take a new lithium battery

SOURCE: 1997 Chevy Siverado 1500 starts, runs, then dies

Have the fuel pressure checked

SOURCE: DIED ON HIGHWAY STARTS THEN STOPS

You want us to just guess?

I will say maybe a fuel pump issue?

Then maybe one of 5 other items !!