Recently my 96 dodge ram 1500 started a weird vibration while driving at several speeds. I have found that slowing down a bit, putting it in neutral and coasting for a bit then putting it back in gear will make it stop or it stops after coming to a stop. The vibration can be felt only from the drivers seat and it feels like it is coming from the floor board area. The vibration is intermittent. The truck still shifts normally and doesn't appear to be having any '****** slippage'. The truck also idle's funny with fluctuating RPMs. It does it at the idle only. It doesn't have trouble with revving while accelerating. I read that the TPS could be the problem with this, but am not sure.
No the idle issue is not the TPS, it is a sludged up throttle valve and automatic idle speed control air bypass valve. The procedure below should cure the idle issue. As far as the vibration goes this needs a hands on diagnosis by a good noise and harness trained tech, tire shops are good for this technican as well of course the Dodge dealer. Find below the cleaning procedure for the throttle valve and idle valve
Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional
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