Engine checks out. no info from sensors in the transmission
Coiuld need fuel filter replaced or maybe weak fuel pump. Can have it pressure tested to see if this might be the problem. Could also be dirty gas which some gas treatment might fix. These are the things i would check first being that you said all the sensors checked out...hope this helps and good luck..
SOURCE: Speedometer does not work 1991 GMC Sierra 2500
the turbo 350 doesn't have a output speed sensor like the trans that came with the truck orginaly. You will have to use a cable to drive a pluse generator,or switch the tail shaft housing with a 700r4e housing of the same length,and use the speed sender from the 700r4e or early 4l60e. note the tail shaft is the same splines but the 350 shaft detent hole my not line up with the relucture ring. therfor the output shaft needs to be change to, or have a relucter ring made.
SOURCE: 1991 GMC Sierra loses fuel pressure after it reaches the TBI
THE INJECTORS ARE PULSED TO GROUND DIRECTLY BY THE ECM...... MAIN COMPUTER... IT COULD BE FLAKY BUT I HAVE FOUND MANY TIMES THAT THE HALL EFFECT SENSOR LOCATED IN THE TOP OF THE DISTRIBITOR GETS INTERMITTANT.... THIS CAUSES LOSS OF SIGNAL TO ECM INTURN LOSS OF SIGNAL OUT OF ECM TO INJECTORS... LET ME KNOW
SOURCE: Engine stalls when stopping.
has it been tuned up lately?????? if so then adjust the idle speed screw at the carburetor....
SOURCE: 01 GMC Sierra - Loud tapping noise upon startup
I have the exact same truck and the same problem. I have been told that the valves and sticking and to try a GUM-OUT type product before spending that much cash. I don't know how a Fly Wheel can cause that but, maybe. I have also been told that the springs/valve rockers may be worn out.
Check the transmission governor could also be a dirty or plugged filter
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engine checks out, seems to run fine. new plugs no codes etc.
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