January 2, 2003i own a 94 gm sierra with a just rebuilt 350 in it it seems to run well but it idles rough, the engine is new,and the throttle body has also just been rebuilt, Also new plugs,wires,cap,and rotor.
Any suggestions. O2 sensor as far as i know is been in for a long time. (no codes appear on dash either). As well as the idle some days the engine seems to run much better than others, like the timing is out somedays??? Ive been assuming its the quality of fuel where i live (northern ontario) as io know of others who get variable gas milage depending on when they filled up.