my f100 i got from utah(provo area) drives like pooh ever since i got it back down here. everyone tells me it's because of the atmosphere difference. What needs to be done?

 

With that much information you mine as well open the front door and throw your keys as far as you can....In the dark!

 

the carb says 9834-3, i htink it's a 600 cfm. the truck drove fine all the back to la. but ever since it runs bad. when i drove up there in a diff vehicle it drove bad too. i know nothing about engines. so any help is appreciated

 

If you know nothing about what your doing Id take it to someone who does...If you want to drive it, But if your looking to learn then youve come to the right place.

Sounds like the carb is tuned to high elevation and your gonna need to re-jet it to sea level, Being your new I'd toss the Holley and get a Edelbrock a hell of alot easier to tune.

Is it puking black smoke? Or smell like raw fuel when its running?

Could also be the spark plugs a fouled out.

Points if its 75 or older,Vacuum leak...Etc

 

Provo area is around 4600 ft, LA is sea level. You'll probably need to lean out the carb jetting. It's relatively simple but if you're not familiar with engines I would take it to someone to do the carb tuning. While it's simple, it's not the kind of thing to get your feet wet with.

 

is that a good demonstration?

 

http://imageshack.us/a/img687/2181/img02551c.jpg
http://imageshack.us/a/img824/3295/img02561f.jpg

Are these peices screwed together somewhere i don't see or is it a stick on gasket? the jets are in here right ?lol

okay the jets are 68s. what should i change them too

 

Genuine Ford Motorcraft carbs: 0-5,000 ft. used the same carb jets / 5,000-10,000 ft. used another / 10,000-15,000 ft. is different again.

Truck may have come from Provo UT, but where was it sold new? Could have been sold anywhere, like Park City UT or Leadville CO, the highest incorporated city in the US @ 10,000 ft.

 

good point, but doesn't help me much. if the jet screws are 68s i should get smaller ones?