I was banking toward cps/kps failure. Codes would help with that diag.
I'd put those bastards back in if I were you. TBI is no fuel injection but it still takes readings from the ECU,
(02 sensors) don't fix what ain't broke lol
Just caught the last few posts.
If your gauge cluster goes whack when you put the headlights on than you've got current crossing overr. That's logical right.
2 things like would do first.
Try a different dash cluster. Swap one put with the a buddy for testing purposes.
If the issue persists...
That truck is SO COOL!
IN REGARDS TO YOUR QUESTION( GUESSING)
the motor sounds tired, you getting lots of blowby?
Besides that I'd change the ignition system plugs wires distributor and advance that timing.
My runs away up hills after advancing my timing.
I think there is a proper way to...
What that guy said.
Motors are a dime a dozen but without knowing what your getting into there could be several other issues.
I'm seeing a money pit.
I've got a k1500 for sale. It will get you home.
I'm in Ontario PM if you want a better project.
Somedays you'll get 12 hours of work done in 4! Other days you'll spend several hours obsessing over "useless" details in order to titillate your sense of originality!
Let's share the custom (uncommon) mods/accessories/chops/ tinkering we've done to make our gmts POP ...
because your labour's...
After taking the serpentine belt off and running it( to rule out accessories) take the valve covers off and check valve lash, could be your rockers are worn out
Explain the sound better and when it happens... I though driveline too but you may have said, the issue also appears in neutral/park yes?