Posted by dave horvath [24.131.120.209] on Saturday, April 27, 2013 at 20:01:37 :
In Reply to: engine stumbles at speed posted by terry [65.95.4.163] on Friday, April 26, 2013 at 18:32:18 :
Have you checked for a vacuum leak? I had a truck with carb set really rich to compensate for vacuum leak. Idled just fine but would not perform under load or at speed. Fixed the leak at the brake booster valve and readjusted the idle speed and mixture. Runs like a different truck.