1986 Toyota pickup 22r

Truck starts fine when I wake up early morning for a cold start. Seems to set choke with a couple pedal presses and runs a high idle until it's steps down to operating speed. Later in the day after work the truck has sat and cooled if I press the pedal to set the choke it stays open or doesn't seem to close very far. I can see it trying to close but I have to do it manually by feathering the throttle by hand while pressing the choke closed. Otherwise it start bogs and falls on its face dead. I can get it to run on what seems like a half choke low idle speed where it runs like crap until it's warm by trying to start it a couple times from in the cab. Occasionally it has had trouble in the morning but it always seems to eventually start with the choke closing by pressing the pedal a couple times.

Side note: the truck ran pretty good before it's always started almost first try every time unless it sat for a few days. Even when it sat all day after a good morning start I only needed to press the gas twice and it would start up just fine. I replaced the AAP which had been deleted instead of replaced a year ago. Broke the BVSV in the process. Replaced all vacuum lines (confirmed no leaks). Replaced BVSV which I'm pretty sure works because it auto turns the choke off when a successful cold start has been initiated in the morning.

 

It could just be a sticky choke linkage. Recommend you start with something basic, like totally cleaning the choke linkage(s) with carb cleaner, letting it dry, then applying lubrication to any and all pivot points in the linkage.
I use light machine oil (mineral oil) like 3-in-1 oil, or a dry graphite or teflon (PTFE) lube. Some old timers use engine oil. Don't use anything heavy like grease as it can attract dirt and such, and cause you problems later.
And don't forget to clean and lube the pivot points of the choke butterfly itself.

 

Great advice. Thank you for your reply. I'll try this first than get back to the forum with what becomes of it!

 

The truck seems to have resolved the issue itself. I honestly think the BVSV I replaced was sticky and after enough starts it just eventually freed up. It's the only part I changed since the issue started. Everything seems to be back to normal now.