Hey guys i need some help i have a 1997 blazer 4.3l vortec its running real rough at idle and i dont think im getting all the power i should at speed i have change plugs, wires, cap, rotor, air filter, and heat temp sensor all thinkn this might be the problem and i have also ran seafoam thru here for a couple of tanks ( she had been sitting for about 6 months ) any help would be grestly appreciated im stumped

 

You should do a fuel leakdown test. Very possibly a fuel delivery issue.

 

Did you have ever check you fuel and filter pump?, I haved a similar problem and when I change both I get more miles per galon and more power from my engine.

do you know the condition from you sparkplugs?

I hope this help

 

pump and filter are less than 6 months old and plugs are less than a week old did a compression check and it was fine

 

What brand of pump did you put in? Any brand besides AC Delco or Delphi are known to have a common issue of failing. Regardless of the brand of fuel pump...you still should do a fuel leakdown test. It could be a pressure regulator or injectors or other things. The leakdown test will either rule fuel delivery out or start you in the right direction. Also, is there any SES codes?

 

Im getting a cylinder 6 misfire code and one shop says its the injectors and one says its air related like a MAF sensor or something the shop that says its the injectors ran the codes and said yea its injectors knowing its the most labor intensive the other place says its running to rich which wouldnt be injectors ???

 

Do a fuel leakdown test. Borrow or buy a fuel pressure test gauge from an auto parts store. Put it on the test port on the metal fuel line heading to the plenum. Turn your key on, leave the engine off (KOEO). In the first ~2 seconds the fuel pump is running you must get a reading of 60-66 psi. You may have to bleed the air out of the test gauge in the first attempt until the gauge goes back to zero and then KOEO again. After the initial 60-66psi when the fuel pump is running, the pressure must stay above 55psi for at least 10 minutes. Don't start your truck during this process. Post your results

Any cylinder misfire can be caused by a fuel delivery issue as well as other things. You can also pull the MAF off and clean it with MAF spray. Be careful not touch the little wire or break it.

 

i will do the leak down test this coming weekend, i did clean the maf but can tell no difference so we checked and it runs the same wither it is plugged in or not plugged in could this be the culprit ??