Hey guys, got a problem here!! Got a 95 blazer 4.3 v6 vortec....Recently (as in past few days) replaced CPI, EGR, FPR and within last couple months, replaced plugs, wires, cap and rotor. Engine idles smooth at no load with a minor missing on i believe cylinder #1 (unplugged it with engine running and nothing changed in idle). When I turn the AC on however, engine rattles entire car! massive amounts of shaking. Also....(remember engine idles fairly smoothly with no load)..when put in drive and accelerate, engine hesitates and bogs down..as if starving for fuel. Pretty sure im running on only 5 cyl. but cant figure out why after replacing all those parts. Searched high and low for any vacuum leaks as well and didnt appear to find any....HELP! could this be a knock sensor, timing belt even.....??

 

u need to check fuel pressure first and report your readings. also did u use AC Deloco cap, rotor, plugs, wires? i have just figured out myself that these blazers are very picky!! u must use AC delco!! do u have any codes?

 

ac delco all the way baby

 

Ngk plugs are amazing in em too