You said you always have those codes. 94 & 44 are r & l side thermactor failure. you yanked it anyway, so those are to be expected. 67 is probably your clutch switch. Does it work properly? 34 means either your EGR valve isn't seated all the way, or there's a problem with the EVP sensor, which is what tells the ECM where the EGR is. The EGR should always be closed at WOT, but if it's inable to close completely, you would get a miss. I'd pull the EGR off and inspect it. Make sure it's clean, and that it seats properly. Also check the electrical connector for the EVP.
Which codes are common?
Take care,
-Chris
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