power problems

I have an 87 4.3l omc my problem is when i give it trottle at low rpms it will die and then when i work around that it will sometimes bogg down trying to get up on step and when i do get it up on step running 3200 rpm it sometimes starts to lose power and bogg down to around 2500 rpm any ideas

 

I'd suspect water in the fuel or a carb problem to start with. Does the motor rev up clean in neutral?

 

Yes motor revs fine in neutral and forgot to say there is a weak and sometimes strong oder of fuel when up and running

 

I suspect a carb problem, either a faulty gasket causing fuel to leak and cause a severely rich condition. I would pull the carb off and put a rebuild kit into it. Set all to factory specs and go from there. Specifically the needle, seat and float settings Is there any evidence of fuel on the motor after you run it? On top of the intake manifold for example?

 

as afact i did notice some on the manifold and thank you ill try the rebuild kit this week.

 

I had a very similar problem with my motor last year. Make sure you replace the float too. They do not come with all of the rebuild kits. Good Luck!

 

You only need to replace the float if there's a problem, such as a leak in it or a broken needle tab, etc. Floats rarely good bad, though eventually they do.

 

Very true PAR however I would hate for him to put it all back together with the old float only to find that there is a pin hole. They are cheap enough and should be replaced in a 25 year old carb with an unknown history ;-)

 

I have a 50 year old carb with it's original float. It's an easy thing to check as well.

 

Sure, and you can even solder the old brass floats too, but for $6.79 why not change it?