Ok guys, here it goes!
Drove about 80 miles to our family farm around 5am, worked my butt off to get some extra cash, cut down 5 trees and split them all up. Back started hurting bad so I came back after dark and parked my truck. EVERYTHING was fine when I parked it. Buddy of mine called me and asked to go duck hunting the next morning, and I can never pass taking some one hunting. So I went to start up the ol 6 cylinder and she started fine, like normal, and went to turn off of a country road onto a highway, truck wasnt even up to N and she wouldnt go over 2500 without stumbling. Called my friend and said taking his truck, no questions asked! BIG CHEVY GUY! Get back after of course killing a limit and now my truck won't rev over 1500? Had to limp it 25 miles home doing 40. Did I hurt something? I drove slow home from the farm, and only had a 4wheeler in the back. Surely it didnt stress anything? What do yal think on this one? Vacumm somewhere? Or maybe egr? Compression in 2-3 cylinders failed all of a sudden? I need expert advise. All of a sudden both my trucks are out. But I'll press the 4x4's problem when I get this one going. Sorry about the story but all this tech gets boring without some "fun" in it!

Thanks guys,
Taylor

 

Year, engine & model?
What do you mean, truck wasn't even up to N? NORMAL on the temp gauge? Neutral on
an auto-tranny shifter? Something else?

On the outset, it sounds like an EFI problem; my daily driver had a problem like this once, I
think it was some idle control motor or sumthin' like that. Cost a lot....

 

I would make sure the choke is opening all the way. It's the door in the top of the carb when you take the aircleaner off.

 

A clue that will probably narrow the search is that it was immediate, rather than gradual.
Remember that most problems are simple, so don't start pulling off the head quite yet.

 

All the info is in my sig, which is the bottom truck. It was all of a sudden not gradual. The choke closes when started, and proceeds all the way "up and down" when the truck is warmed up. Yes I said N on the temp gauge.

 

I don't display any sigs, I find they take up too much real estate for my liking.
I guess that's what you meant, but it's not what you said:
Whatever.

OK, so, your choke seems to be fine. I'd be inclined to check gasoline flow by pulling the
filter off the carb, put the gas line + filter assembly into a glass jar or bottle, disconnect
the ignition, and crank the engine with the starter motor (using a jumper on the solenoid)
for 15-20 sec. to see if there's a free flow of gasoline to the carb. This identifies a
problem with or rules out problems in all components from the carb-mounted filter to the
tank (pumps, tank filters, sending units/pickup tubes, gas tank, rubber hoses). One of
my rubber hoses at the rear tank had dry-rotted and fallen apart (the joys of arid
environments + age, I guess).

Note, be careful with this technique, it can splash gasoline where you don't want it if
you're not careful.

Could be a clogged jet in the carb or a carb needing to be rebuilt. Vacuum leaks that
cause that kind of behavior would need to be significant.

Following that is the ignition; wires, spark plugs, cap and/or rotor, magnetic pickup in the
distributor come to mind, followed by the coil & ignition module.

I don't AT ALL suggest throwing new parts at it until you come across something that
fixes your problem, that's a waste of money & time. Troubleshoot your problem, change
only one thing at a time. It sounds like it could be a fuel delivery problem, I'd start there.

-ct

 

change fuel filter you been use cheap gas.

It happened me 6 times so I start buy 3 fuel filters and put in glove box when it start get this problem i just swap new one then it work fine.


That was last time it have problem when I stop use gas station that was so cheap.


first we think carb then fuel pump. Found that it was fuel filter that have red dye on it. this show gas was not normal gas it have additive STP in gas.

 

Get out a vacuum gauge and check the vacuum. Tell me what it reads. If it drops to zero, bad cat converter,or if ain't satying between 17-21 PSI, something wrong with the vacuum.

 

How does zero manifold vacuum == bad catalytic converter?