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The code P1294 means that the computer is setting a target for the engine to idle at and the engine cannot do it therefore setting the DTC. Solution start by checking or replacing the sparkplugs. Also remove the idler motor from the throttle body and spray it out with carb cleaner. Also spray out the passages in the throttle body that the idle motor use. If that does not fix it you could have another problem like a bad idle motor or something relating to that circuit. Did you replace the TB or make an adjustment to the TPS? As for your spark knock(pinging) this could be related or not. Most of the time pinging occurs is from high combustion tempertures. This could caused by worn plugs,cap and rotor. If not that maybe the truck is running lean but I doubt it because you did not get a code for that. Another thing that could cause pinging on a Dodge truck is oil going into the combustion chambers(i.e. the intake belly pan gasket leaking very common). If you change the plugs go with Autolite 3923 this is one heat range colder. And I forgot to tell you after you make a repair to disconnect the battery for at least 10 minutes this clears the KAM (keep alive memory).
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