rough idle help on 05' Colorado
I need some help from the Colorado guru's out here.
I figured today was a great day to do some maintenance work and also try to get rid of a 0455 code my 05 Colorado 2wd 3.5l I-5 was throwing.
I ordered a new Delco 214-2147 vapor canister solenoid of the web. From the research I did on these forums, I figured that this was a cheap and good place to start. I replaced the solenoid and then I decided since I recently purchased this truck a month ago and it had 116,000 miles on it, that it was a good idea to replace the plugs and fuel filter. The fuel filter went perfect and then the plugs weren't bad either. After I was all done and started up the truck, everything seemed ok until it finally idled down. Then it started to run a rough idle. When I put it in gear with the brake on, it runs even rougher once it idles to 800 rpm's or so.
I used AC Delco double platinum plugs (41-834) which were recommended by the Auto Zone mananger. I pulled out AC delco (41-981) which were in the truck when i started. I never had an issue with the rough idle until this happened. Also I did not gap the plugs at all when I replaced them.
I believe all the plugs are in securely and that all the coils are on well also. I know I didn't swap coils because I marked them.
Does anyone have any suggestions on where to go after this. I am at a loss right now. Any advice would be greatly appreciated.
I also cleaned the MAS and throttle body after all this to see if it helped. NO Luck