I have a '00 Blazer with a 4.3. My ces light has been on for weeks. Code reads "Low Idle Miss". I have gas in cylinders 2 & 3. I went ahead and perfromed a complete tune-up. It still has rough idle when just sitting still. On the freeway, it was great. Gas mileage is in the toilet. Only getting about 14 mpg. Could this be a fuel injection problem? Can they be bought separate or do I need to buy the whole octopus? Would checking the fuel pressure do me any good. I had this problem many years ago in my '327, but it was a bad cam lobe. Any ideas? I appreciate your help.

 

Un-bunrned gas in 2&3? Checked them for spark?

 

Yes. Checked spark and compression. All cylinders are holding at 180#.

 

It looks to me like you can get the injectors separately. About $65.00 each new.

 

You can buy the injectors separately, but with old and new injectors in the same engine, you can create an imbalance in fuel supply. If you have to replace more than one injector, you should consider replacing the whole spider.

 

Thanks for the advice. I have purchased the whole spider and will start this project early next week.