Please help, 2000 Chevy Blazer constant engine misfires # 4 cylinder. Just
replaced Plugs, Cap, Rotor, Coil,Wires.Same problem for years truck runs great
normally, love it but no one seems to know where problem lies.Any ideas?
Thank You

 

Have you checked the compression on all of the cylinders, comparing with #4? Has an injector balance test been performed to see if the #4 injector is working properly?

 

Not yet but will tell mechanic. Thank You

 

i had several misfires on mine.did same thing u did ,bought this and that.and i still couldnt figure out what it was untill i went to this forum and did some investigation on youtube too.on what could b the problem.and it all made sence.it was giving off bad smell through my xhaust and running like crap and loosing horsepower too.and it all came to fuel injectors.bought mine from amazon this yr.put them on and it runs like new.r u having any problems like i am?

 

This thread is over a year old, im sure they figured out what is going on by now.