Any of the following.................
1. A bad pressure switch.
2. A bad pressure switch pigtail.
3. A bad clutch connector.
4. A bad ignition switch.
5. A bad a/c heater controller.
electronic control module may be defective
BROKEN CRUISE CONTROL CABLE (CHECK AT THROTTLEBODY AND FOLLOW TO TRANSMISSION)
A 4L60E would not fit on a 91 Silverado because of the different dimensions.
it sounds like you may have a short somewhere in your lighting wiring. its grounding out and stalling the motor.
No, There would not be a 4500 version of Silverado.
shorted a wire? knocked a wire loose?
Be sure that the dash light brightness control switch is not turned off.
Idle control motor defective.
mine did the same thing and would not stop until i changed the brake lines also, then it stoped.
it could but it would be a whole different shape
I had this problem about a year ago. Turned out to be all the bulbs were burnt out on mine. There's 3 (or 4) miniture bulbs that are accessed by removing the heater control.
If they are all not working, I would suspect a blown fuse, or they are just turned off. There is a rheostat used to control the brightness of the instrument lights. If it is turned too far the lights will go off. Find the control and turn it. Sometimes it is the reset button for the odometer and sometimes it is a separate control. Look in your owner's manual for the location.