I am turning 16 in three months and I bought a 1986 720 king cab ST for when I can drive. The truck has a z24 in it and it's lowered on three inch blocks. I'm still learning how to fix and maintain the truck myself and I came across a problem. It fires up nice but when you take your foot completely off the gas the rpm's start to drop and it dies. The carb is fairly new and I just replaced the intake manifold gasket ( it was torn up). I has hoping somebody could help or give advice for working on my truck. Thanks for the help.