Ok, I have had a nagging problem for over a year with my 2003 4x4 dodge ram hemi 1500 (70K miles). The truck feels like it is starving for air or fuel. It has no torque and horrible throttle response. It takes a full throttle stab to get it to downshift and accelerate while driving. Even under full acceleration it will only rev as high as 5K rpm and it labors to go over 70 miles per hour. I have taken the truck to 2 seperate dealerships and no one can find the problem. Ive replaced the cat & muffler with high flow versions, both O2 sensors, plugs, inject cleaned, checked fuel presure (47-50 PSI), checked my grounds, etc. There are no codes now and the only ones ive had in the past were O2 sensors and evap system (very intermitant). The probelm occured suddenly while driving down a rough road. I thought it was a colapsed cat or plugged fuel filter but both have been addressed. I guess theres only electrical and induction/throttle issues left and I dont know where to begin to look. Ive heard of some guys having issues with IAC's and TP sensors but i figured those would throw a code. Im all out of ideas and any direction/help would be most appreciated. Thanks in advance.
AS far as IAC goes, you would probably experience stalling at lights, on turns , anytime engine under load like AC on at stop. TP sensor? Maybe, but is easy to check with an ohm meter. I'm sure you have checked all brakes for possibly holding on slightly. You have checked throttle pedal & linkage to make sure pedal down all the way, is opening throttle all the way? Does it feel at all like it's holding back, or just starving? Any good tranny shop that could check torque converter for proper operation in your area? One other idea would be to join free, at (allpar.com) and post there, as that would be a spot where all or a lot of guys with same vehicle may be able to shed some light on it for you.
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