Ive got a few problems with my stock 86 k5 w/ a 305/700r4/208. 1. Engine issues: When i take off from a dead stop the engine seems to lug a bit. I have a new fuel filter, new plugs, wires, cap and rotor. The plugs are gapped to spec and timing is also to spec according to the sticker under the hood. I have also rebuilt the carb. The engine also has a bit of rough idle. It idles at about 500 RPM at operating temp. Also the choke does not work. It also smells like its running a bit rich. Where should i start looking? Should I just get a new carb? 2. Oil Pressue guage: The stock oil pressure guage seems to bounce around 30. Do i need to get a new guage? 3. Transfer Case: sometimes the case doesnt want to go into 4hi from 2wd. If I back up a bit it goes in fine. When i go from 4hi to 2wd it shifts fine but sometimes it doesnt come out of 4wd. If i back up it comes right out. The case is full of fluid. What is causing this? Sorry this is so long. Thanks in advance for the help.