No, the 2012 Colorado(4wd) has a torsion bar front suspension, will the 2013 silverado(1500 4wd) has a strut front suspension.
There is no air in line Fuel pump pressursizes line and air automatically bleeds from the injector Not enough fuel or pressure will cause rough start
Check all vacuum lines
It sound like your catalic convertor is stopped up. Unbolt it and drive it. If it runs a lot better, replace it or leave it off.
If you know the spark plugs and wires are good, then check for a vacuum leak. The vehicle is 11 years old, and you may very well have a crack in a vacuum hose. A leaking intake manifold gasket will also cause rough idle.
What might cause your 2002 Silverado 4.8 to run rough under a load could be clogged fuel injectors or a clogged fuel filter. It might also run rough under a load because of a transmission sensor issue.
vacuum leak?
Rough Country - 1927 was released on: USA: 23 October 1927
There could be several reasons that your 1995 Chevrolet pickup truck, will not accelerate and idles rough. The most common reason is a plugged fuel line.
Definitely not only 88-2000 Chevy these are referred to the c1500 or k1500 c is for 2wheel drive k is for 4wheel drive. Also c2500 and k2500 are 3/4 ton. 2000-2006 (the new body style remember the gm strike) are completely different frames a-arms etc. That's also when Chevy rolled out and renamed the half ton the silverado1500 series and were available with these engines 4.8 5.3 and the 6.0 in some denalis. I believe cst fabtech rancho tuff country and rough country all make lift kits for your 2006 Chevy. Check craigslist always good deals on there and rough country just came out with a new kit that is redesigned and a little cheaper than their old kit .
I just had this problem on my 2004 Colorado. The Idle Actuator control motor on the throttle body was bad. Cost $160 for the part.
replace timing chain
Check the motor mounts.