Very often yes. LandCruisers are famous for that.
Some carbs seem to be "better" at something, they all seem to work.
I thought that a '76 carb would be a vacuum secondary. Could be wrong.
More pics of your carb please.
Here's my 12/73...
Yeah, you.
There are a lot of very good reasons to rebuild your own carb.
Pinhead (no relation) has videos on the YouTube on how to do it. Many threads on 'Mud on same.
You can do it in a weekend, have you checked the turnaround time elsewhere?
Not to disparage the big names already...
Leave the blinker out of it for now.
You run a ground wire from each of your light housings to the nearest good ground.
Imagine this is a taillight housing, attach one end of a wire to it. Attach the other end of the wire to a nice clean piece of body or frame.
No. The actual blinker unit, under the dash, is rarely a problem.
Adding a ground wire from each of the thin metal reflector things that the bulbs sit in to a solid piece of grounded metal often solves the blinking problem.
Front fender mounted blinkers are grounded thru the hollow threaded rod that holds everything to the fender. Those are probably rusty, and will break if you put a wrench on them.
Smart people will run a seperate ground wire from the socket to good sheetmetal. One wire for each bulb housing.