Ok, that usually means that all the sensors etc. Etc. That are regulated by the computer are reading within spec.
There is a common problem with the fuel injection system on these engines. GM is VERY aware of this and has developed an upgraded fuel injector system for this problem. The problem is that a GM dealer must determine that this problem exists. The fact that you had the injectors cleaned and you had briefly positive results, leads me to believe that it is a fuel problem. A failing fuel pressure regulator is common and this may be your problem. However, this part is located under the upper intake manifold cover. Your injectors are also located and accessed under this cover. This cover should not be taken on and off a lot -- SO -- if you can get the chevy dealer to determine that the fuel injector system is to blame, they should repair this for free. And if a new upgraded injector system is installed they all come with a new fuel pressure regulator. Whoa!
Check your spark plugs. If you replace them or anyother ignition related item, make sure you use A/C Delco parts -- just trust me. If the gaps are good -- what do they look like? And be specific as to what cylinder they came out of.
Saturday, January 17th, 2009 AT 5:42 PM