I have a 94 4.3 vortex.
Symptoms
Strong sulfur smell
Runs great until warmed up (5 minutes),no-little response from the gas and reduced power.Idles great and will rev up fine in neutral and park.
Changed plugs and wires and cleaned egr(again)
o2 sensor?
Cat?
IC?
Where should I start first?
Thanx in advance for your replys

 

what were ur spark plugs like? and have u noticed bad mpg? could be the spiders or the fuel line in the plenum has a leak.

maybe something like this

 

clogged catalytic converter (The triple c effect...)

 

Plugs were a little carbed up,not burn't or anything>i just bought it so I really didn't notice mpg.I really hope its not the spiders when hooked up to a computer it doesn't read any code but it is running rich.It only gets bad after Ihave beendriving for 5-10 mins and it reaches normal running temp.I will have to accelerate very slowly or it will buck and sputter,but wont stall.If I pull over I have no problem starting it or reving to high rpm.
Thanx

 

I really hope so That would be alot better than the $400 spider injector.I don't have to worry about emmissions so a piece of rebar and a hammer would be alot cheaper.

 

I strongly suggest changing out your catalytic converter, thats were the sulfur smell is coming from!!!

 

I agree with the bad cat diagnosis. You may not have to pass a State emissions test, but if you drive it on the streets in the USA, Federal law requires a working catalytic converter.

 

Put on a new cat,still have same problems

 

Just replaced lower intake and spider,Someone had broken the egr mount.After new cat,intake,egr,and spiders.Found out I need Fuel pump.You can see on the pics that the spider was leaking.Hopefully this will fix everything...This thing is a bigger money pit than my house.

 

doesnt look like the spider was leaking more like the FPR (Fuel Pressure Regulator) and that could be a reason with your CAT. Just becasue you replace that CAT doesnt mean your problem is solved there is always a reason why they go and you should always trace it back to why its happening. It was dumping extra gas though as you can see its more clean.