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Re: acts like its choking out when i sit and idle for a...
It maybe a vacuum line so check all of those to make sure one is not loose or off and put some STP gas treatment in the fuel tank make sure it has at least a half a tank of gas and if the STP helps then replace your fuel filter
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Not sure what you are working on, but it sounds like your coolant temperature sender is bad. When the truck is supposed to come out of phase lock loop it is not and is acting like the choke is on all of the time.
Your symptoms do not sound like an EGR issue (but could be if only slightly dirty and stuck) but rather could be a bad coolant temp sensor,which is much easier to replace. It can be tested also, but most are so cheap I just replace them. This part acts like a choke on old carb engines and can fail such that kind of like a stuck on choke.
You don't say what make of car but it's about the same for all. Your problem is the choke adjustment. The choke raises the idle when the car is cold and after warm up drops to normal. You are doing the chokes job when you hold the pedal down, once its warmed up the choke no longer functions till cold again. So check the choke and the high idle speed adjustment. Simple fix. Hope this helps mike
I take it that you have a carby in which case adjust the choke cover so that the cam engages the throttle lever and holds the throttle open until the bi-spring in the choke cover moves enough to move the cam out of the away allowing normal idle. If you have efi (Not from your choke word) then run fault codes and see which sensor is faulty. There should be an idle speed around 1200 RPM idle in efi for around 3 minutes and then the idle should drop back.