Just subscribed to this forum. Seems that I've got the same hesitation in my 1993 K1500 5.7 liter. Problem NOT solved by (1) new EGR (2) new O2 (3) new plugs (4) new fuel and air filter. I will be replacing the wires and cap/rotor this weekend.
Suggestions from this forum mention the following:
- fuel pressure regulator
- mass airflow sensor
- cleaning throttle body
- leak in intake manifold
- fuel pump
- knock sensor
I did buy a fuel pump but not looking forward in dropping the tank.
The symptoms of hesitation occur after warm-up, @ 1500 RPM and light pressure on the gas pedal ( I have a 5-speed manual), and runs better under more throttle, higher RPM. Gas milage has declined. Will keep posted.
