My 1994 s10 blazer with 4.3 engine has a miss under power and ive replaced the plugs,wires,cap and rotor! Fixed several vacum lines and it still misses any help???????

 

Do you have a code? if so what is it? Also what brand did you use when you replaced those parts?

 

If you have an engine light, whats the code?

No engine light? Then its fuel related and you should check the injection spider for a leak... This is an incredibly common problem on these engines when they get to this age.

Pull off the vortec cover on top of engine. Remove that black puck like thing, shine a light in that hole... It should be completely black in there. If you see any gold at all you have a fuel leak which explains your missfire

I really gotta make a copy/paste of this info so i can stop typing it everyday

 

Just had same issue yesterday. Same symptoms. Pulled the plenum, sure enough the FPR was leaking. Replaced and it runs awesome again.

 

The spider injection was replaced not long ago so help????

 

And no code

 

Check it again anyways. Could be the plastic hoses that run to it. If its nice and dirty then check the fuel pressure with a fuel gauge. must be above 60 at key on and hold above 55 for 10 min.

 

Just cause they did the spider, doesnt mean they did the hoses.

Im willing to bet the expensive spider was ok, and the fpr was leaking, so they sold you the whole spider unit instead of just the hoses and fpr... The spiders failing is fairly uncommon.

 

Lol maybe there should be a sticky on spider replacement on cpi too

 

Ok how do i check the fpr? And what hoses??