GMC Sonoma with weak performance
I have a '94 gmc sonoma 4.3, v6, 4x4 which starts always great and run great; most of the time.
Sometimes he looses significant power and is almost dying if i push throttle completely. When releasing slightly it picks up again. Any idea? Maybe gas/air mix is too rich? How can i adjust it?
Second phenomenon: Every couple of driving hours and completely irregular the engine just shuts off. While still rolling by turning the ignition key to off and on again it runs again without problems. That happens always while on long run with constant speed, never in town or on unpaved roads. Any speculations?
Your help is appreciated!