[DIAGRAM] 4 3 Vortec Vacuum Diagram
[DIAGRAM] 4 3 Vortec Vacuum Diagram . Rough idle, shakes the whole truck. 2004 4.3 vortec, rough idle, engine dies, no erg valve, no check engine light. 1996 4.3 vortec 1500 w/ manual trans, 200k Hesitation and misfire problems, code p0300 misfire from www.justanswer.com Picked up a zr2 blazer with a rod knock, put my rebuilt 4.3 from my truck in it, got it running but it's a bit shaky at idle. Symptoms of bad vortec spider injectors. 4.3 cpi rough idle ,pops on acceleration to.