My 88 d-50 has idling issues. The story goes the truck was running fine but would not start after setting over winter because of broken brake lines. After I repaired the lines and the truck would not start. Fuel pump seems to check out ok but no fuel was getting through the carb. Bought a carb kit and replaced pump diaphragm and float valve and some other items . Got the engine running and appears to take gas good, the problem is, it won't idle and quits running below about 800 rpm. Checked vac. hoses and idle adjustment screw. Does anyone have any info. on the idle circuit or what could cause this issue on the mikuni-solex stock carb. model 30-32 didtf? Just took off top of carb. to replace the items. Would the feedback solenoid have anything to do with it? I would like to convert to weber or holley but can't afford to at this time. Thanks