Old, New guy, with Old Problems

[ChevyTech]

As for the injectors spraying to much fuel:

This sounds like a bad coolant sensor, but there are two coolant sensors.

The coolant sensor in the cylinder head is for the instrument panel gauge / light.

The coolant sensor in the intake manifold next to the thermostat is for the computer, and this sensor determines how much fuel the injectors will spray. If the connections are not tight or corroded it can cause it to spray to much fuel just like the sensor is bad.

Post 11 in this thread has instructions for testing the coolant sensor for the computer:
http://67-72chevytrucks.com/vboard/s...d.php?t=379142

When the key is on there should be power to the injectors and the computer grounds the other side of the injectors to make them spray.

The EGR solenoid has nothing to do with the injectors.

Sometimes the injectors wires get rubbed through insulation by the TBI unit and the big collar that sits between the TBI and the air cleaner. Make sure there are no bare wires.