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Most low idle speed problems on these engines are due to a faulty idle air control valve but since you state the idle will go up and return to idle then i would say it is working properly i think you have a throttle body coking problem ( dirt and grit accumulates around the butterfly valve in the throttlebody ) to fix this simply remove the fresh air hose from the throttlebody and open the throttle all the way up use a clen rag and wipe clean you may use a solvent such as B12 on the rag but dont use too much
Top dead Center Sensors are the 2 codes you have, showing no signal
I found that on internet & don't know how to paste to this site
Just put OBD2 P1362 etc into your search engine & there are pictures & causes
I find YOU TUBE & watching Video much better than this social blogging site & I try and answer questions here, if I can point people in some direction.
check condition of air filter.suspect fuel filter if your truck is fuel injected,as filter on some models is mounted below intake manifold,behind starter,difficult to access & often neglected
time for a head gasket your car has a blown head gasket common problem. Do a commpression test on each cylinder to find and commpression lost if so you know you need a need head gasket. Make sure you have no more than a 20 psi diffrence and add a little oil helps for commpression. The kit to test is called a commpression test kit you can rent it or buy it in an autoparts store. Call them to ask if they have on on hand before you waste time.
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