steve hughes
Well-Known Member
- Joined
- Jul 5, 2002
If you are sure it is timed correctly then pull the throttle body off the manifold. TBI chevies are bad for the tb gasket coming apart. If that looks good make sure the vacuum ports on the tb are not clogged with carbon, another common problem. When you timed it did you unplug the timing connector? If not your timing will be about 30 degrees off. If all that looks good it most likely is the coolant temperature sensor located in the manifold by the thermostat housing. The sensor sometimes goes out of range and makes the engine thinks it's cold when it's warmed up making it run rich. This is also a very common problem on tbi chevies.