Trying to hook up a new throttle cable

I agree with Mike, year--make--model would help?
If this is an older carbed engine, no computer, if you get a carb kit, the kit will usually have the instructions for setting everything. As far as your throttle cable, I can't see anything from here. I guess, I'd have to look at it. Can you adjust the idle w/o the throttle cable then hook up the cable? Hopefully the idle stays the same?

My guess off of the limited info is that the card is gummed up.

Did you try to check for any codes?

has cable from pedal to throttle positioner on engine side of firewall

Give Jacks Small Engine a try -


https://www.jackssmallengines.com/jacks-parts-lookup/part/mtd%20yardman

Besides the service manual you can view parts diagrams at a dealer like www.arcolawn.com. You can purchase the service manual at a dealer and it will show you how to hook it up.
The throttle linkage hooks up to the throttle shaft closest to the engine. the governor spring attaches the governor arm to the throttle linkage.
The choke cable attaches to the shaft farthest from the engine. I hope this helps.
PS your engine has two factory service bulletins on it.
Joe

First, follow your throttle cable down to the carb. Locate the clamp that holds the housing in place and loosen it just enough to move the cable. Start the mower and adjust the idle by the screw that touches the same plate that your cable hooks to. Then push the throttle control to idle and retighten the cable clamp.

Spring goes from throttle air valve to plastic lever under flywheel. Cooling fan on flywheel provides pressure to open/close throttle. As engine (fan) speeds up, pressure on lever causes throttle to close. As engine slows, throttle will open. System achieves an equilibrium very quickly.

hope it helps!

Need more information. Is your cable hooked up to the carb or broken? Try checking that. Rick

Have a look at the cable where it hooks up to the throttle body.
Have someone push down on the accelarator while you look, make sure the throttle body is opening all the way.