Not looking to hijack the post, but I'm back with the same issue.....perhaps two people with the same issue could shed some better light on the subject......67 K 20 - 250 Rochester 'B' manual choke. This summer I posted, and the replies were basically the same...I did all the tests & checks, with exception of removing the valve cover, looking for a bent pushrod....I once again took apart the carb - confirmed the small & large balls were where they were suppose to be....as with the internal springs....I again sprayed carb cleaner in every port & hole I could find, & blew plenty of compressed air through the passages....The one thing I found that I had missed was the 'flat rod' that attaches to the accelerator pump was sticky with reside... I steel wooled the flat rod & cleaned the slit it went through. I reinstalled the carb on the truck and it starts & idles wonderfully...but as soon as I start to give it gas it stumbles & wants to stall, but I'm able to catch it.....If I feather the pedal, I can get the RPM's up, but it takes a bit of doing......& again, it seems to be better running on choke..... I don't have a fuel issue, The gas I use is non ethanol, & still use Startron....My question is the float setting....upon slight acceleration, would the reservoir empty so quickly that the fuel pump could not keep up with it?..I'm talking slight acceleration, not dumping my foot into it......
