Loss of power, but no mention of rough or inability to idle (including stalling). If those additional symptoms are part of the problem, check for a vacuum leak to the intake. Listen for hissing or sucking noises near air hoses. Look for loose, cracked, or broken air hose connections. Check PCV valve...Cheap to replace, could be sticking, then loosen after truck sitting with engine off. A vacuum leak will not give any light indications, and vehicle will seem to run normal when applying gas, but will want to stall or run rough (or want to stall) when at idle or sometimes when taking foot off gas when slowing down.
SOURCE: Truck losing power and service engine soon light on
Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.
SOURCE: 2007 Chevy Silverado check engine light came on.
the check engine light is on to tell u that one or more of about 200 possible problems has occured in the electronic engine controls or emissions controls and monitor system, this kind of leaves guessing out due to the number of poss problems so you must take the truck in and have the system tested for the troulbe code that is now stored in memory
SOURCE: 2007 chevy silverado 2500 hd duramax shut down
mo me it sounds like low fuel volume i would check my lift pump
SOURCE: 2007 Chevy Silverado when my check engine light
It's a safety feature. For example, if there is no oil pressure when you start the engine, you could not see that unless you were in the car and could spin a bearing or seize the engine by starting it remotely and letting it run unattended. So when the check engine light is on, there is something not working properly with the engine/engine management system and it wants you in the car where you can see the guages and turn the engine off immediately if there's a serious problem.
SOURCE: my 2007 chevy silverado engine hot/acoff light
I had the same problem on my 07 silverado. Nobody could figure it out but it turned out just a thermostat. I was sticking on occasion and tripping the sensor. The message that comes across the dash is the same for any heating/cooling problem.
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