BAd shake K-1500

ran for 23 years and only failed just today or?
that is spark(violent felt) not fuel.
if you'd have scanned the pcm OBD2 PORT AS IT misfires
THE pcm TELLS YOU WHICH CYLINDERS MISFIRED.
DCT P03XX .
ARE THE SPARK PLUGS 23 YEARS OLD? GEE./
IT NEEDS A TUNE UP.
SPARKS, WIRE SETS , FILTERS.
IT HAS a DISTRIBUTOR 1999 V8 , try a new cap ,rotor and HV wire set> ?????
as seen here

https://www.rockauto.com/en/catalog/gmc,1999,sierra+1500,5.3l+v8,1355475,ignition,distributor+cap,7120

control arm bushing need replacement

Have the wheel bearings checked.

Yes i would say it is a selonoid in the trans or a bad electrical connection. Get under it and pull the electrical plug off trans. If it looks corroded clean it with electrical contact cleaner. Be Very Careful when hooking it back up.Do Not force connection back together or you will bend pins.

Sounds like a Solenoid might be bad on the starter if it spins freely and a high rate of speed without engaging.

Also, the relay could be bad.

I am ot sure if the fuel filter and pressure regulator would cause this problem.

No code will show with a bad starter or bad relay, I don't believe.

Good luck with this one.

like driving parking lot speed, the steering wheel or the back shakes??? = bad tire.

sounds like a timing issue.check plugs, distributor and wires to start.

Sounds like a bad front cv shaft.

fuel pressure on a v6 or v8 is 60 to 66 psi

crankshaft balacer going bad,can cause the crank to break if left unchecked