Hi! Here's what I found out on mine.I had the same problems as described above-and my rochester carb was new/rebuilt out of the box, with a new fuel tank and fuel lines.After 2 days of adjusting,cursing,and scotch(in me,not the truck) I came across a site that mentioned the VARIOUS size jets...available for them-based on engine size,manifolds,etc. I dismantled mine, swapped for a larger jet, and it smoothed right out! here's some info on Rochester carb.jet sizes,and hopefully you may solve it. I've got a 261, and mine was a 54 I think. Good luck, steve
46' 1 1/2 ton Panel /
rochester info.
