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Loss of power

Even sitting, no load?
Pull codes- could be some stored or pending without light.
Clean AirFilter?
Any smoke?
Any recent work done to it?
Details help.
 
Even sitting in park won’t go over 2000. Definitely going into a limp mode won’t shift into higher gears
Feeling the arctic blast last two days. But this started few days ago temp was above freezing and I had plenty of fuel treatment in both tanks
I have to get someone with a good code reader to check for current or saved codes My cheap one not reading any codes
 
No smoke starts and idles fine takes off with dull power from a stop but won’t go over 2000 rpm in any gear
I’m changing filter and filter housing in case there’s a leaking o ring
People on other forums have suggested faulty map sensor but when I went to local Napa parts house I was told they don’t list a map sensor for this truck. Only a maf sensor
 
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