if it has fuel injection i would check the o2 sensors.i had a gm that was running way to rich so i did a diagnostic check and found out the o2 sensors were bad sending wrong info to the computer and messing up the mixture.it ran fine under power but only at idle you could tell.my car was a 91.
You can adjust the idle air control valve on a 1992 1500 truck while it is just idling. This is done if the truck is idling too fast or too slow. It will help the truck run better.
There are many reasons why your car might vibrate while it is idling. It could be running too hard for example.
you are flooding the engine
Is the AC turned on?
yes
It depends on the truck ie;a volvo 780 burns 7.0 gallons in 10 hrs.
Is it a manual or automatic?
While owning a vehicle is important to know the engine oil capacity. In a 1991 Chevrolet Silverado truck the oil capacity is five quarts of oil with the filter change.
While it is possible with a spindle drop....Why would you want to drop a 4x4 truck?
I know that on my 1998 Silverado, if I but the parking brake on, the fulltime headlites turn off while I'm sitting and idling.
Aprox 195 degrees F.
The Colorado is a mid-sized truck, while the Silverado is a full-sized truck. The Silverado is more spacious and capable of towing heavier loads. The Colorado replaced the Chevrolet S-10 Pickup not too long ago.The 2008 Chevrolet Silverado is a refined and a very quiet ride that has very comfortable seats which are ideal for the long drives.