This is a typical carb issue. The weber is a little over jetted for our 2.6L and most people jet the carb down. use the search tool for weber. the guys here gave me some good tips on how to tune the weber. your idle screw will not be turned out much at all. probably 3\4 to 1.5 turns. Is your carb new? what model is it? 32\36; 34, 38?

'88 Raider. 2.6L dead...2.4L swap in progress, AT, 33's, 2 bouncy seat,AC, CC, 2.25 exh, 2" Tbar, 2" BL, rear DB, rear LSD,4.90's, SW hubs,gen2 uca's, KYB shocks, snorkel, elec fan, MSD.

'99 chev k3500 crewcab
'15 Subaru XV
'03 BMW i325