I have a 2006 Ram 1500 5.7 hemi. When starting up in the morning (I live in Phx) there is a popping noise about every 15 sec. coming from the intake/throttle body. The engine runs rough and when you rev it backfires (alot) through the intake. As soon as the truck warms up (about 10 Min) I can shut it off and restart the truck and it purrs like a kitten. I also noticed when sitting at a stop light sometimes the tac drops to 0 when the truck is running. There are no codes coming up I have had the Dodge recommended chemical combustion chambers cleaned, replaced the throttle body with no luck any ideas??.
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