I have a 91 sambar that i just took the carb out because it is very hard to turn it over. I had to feather the gas pedal till it warms up and then it runs fine. i took the carb out, no small feat for my limited knowledge in non-efi engine, and the butterfly valve facing the engine untake seems to operate fine, but the back part facing the forward of the truck is gummed up pretty good, sticky at best. so what am i looking at and how should i check for proper condition? Thanks!!