Ok I have an intermitten stumble that I cant seem to pin point and I need some help. The truck is an 85 with a 22r, has a weber 34 34 carb and a nwor hedder. Im gonna list all my symptoms and lets go from there. On a cold start it fires up and runs perfect just sitting but under load it will bog out just bababababababababab and it gets worse if you give it more gas it ll actually backfire. It will go away once it gets its head up or until it warms up. Now the stumble usually takes place on hard braking then when you get back on the throttle or during a turn it just does it once or twice usually. I have the timing set a 0* and have had it set as high as 8*btdc. Ive went through the procedure for idel mixture and have it set accordingly at about 1 3/4 round out but I also have two idle air mixture screws. Ive had it leaned out and really couldnt tell a difference on either prob. I aslo have fuel regulated a 3psi any Ideas guys thanks.

 

Two things come to mind that could cause this. Are you running a fuel presure regulator on your weber ?. The fuel presure needs to be at 3 psi or less, any more and it can cause the problems your having. Also if the float is set to high it can cause problem like your having.

 

As stated fuel pressure is regulated. And timing is set to 0 as my id tag calls for but my float isn't adjustable I looked at it today. It also seems to be a lil worse