I have a 98 Dodge 3500. Only mod is straight piped. The truck idles fine when it is in park but if u turn the wheels or put it in gear it gets really rough and wants to die. Any help is greatly appreciated.

 

what is the idle speed when you put it in gear? sounds like you need to bump it up a little

 

In park it is like 700-800. In gear 500 or lower

 

yeah that sounds to low idle. when mine was that low it would die if you let off the gas to fast. bump idle and no more problems

 

My bad it is kinda slow not real fast. Slower than my 02 F-250

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Nevermind what i just said

 

It shouldn't drop that much just from turning the wheel or putting it in gear. 700 rpm ,no load, is spot on. Did you ever replace the lift pump? When there on their way out they drop PSI at idle, putting it into gear should only drop about 50 to 100 RPM, but its sometimes enough to drop fuel PSI down to almost nothing. Check for bubbles in the fuel return line too, change RPM when checking. If bubbles you have other issues than a low idle. All this is assuming you already changed your fuel filter and have no issues with the fuel itself. Hope this helped..

 

Idle should be 750-800 in gear with the AC on.

 

It is close to that but drops when i put it in gear. it doesnt do it every time though.

 

READ the post above again. 750-800 rpm IN GEAR

 

So sorry!!! it is about 500 when it is in gear and it drops. READ THE POSTS ABOVE