having issues with my*truck. Its a 2004 ram 1500 with a 4.7. It has a little over 208,000 miles on it. My issue is that it is idling around 1800*rpm*while in park. It drops to about 1100 rpm when you put it in gear. Ive replaced the throttle position sensor and the idle air control. Checked for vacuum*leaks*but couldn't find any. The throttle cable moves freely and so does the butterfly. I took the throttle body off and cleaned it. When driving the truck it will*gain*speed*up to about 50 mph. While driving if you put it in neutral the engine will rev to around 3000 rpm. Sorry for being long winded, just trying to pass on any info that would be useful. Any help would be great. Thanks in advance

 

A vacuum leak or cracked manifold is really the main thing that would cause this kind of issue.... did you do a smoke test to check for any cracks on the underside of the intake manifold? or anywhere else that you can't see beyond the TB.

Also, are you throwing any DTCs? (is the check engine light on?)

If so, What are the trouble codes?

 

There isn't any codes. I haven't done a smoke test on it. How would I go about doing it

 

Most good shops will have one... basically they hook up a machine to the intake and they pump it into the intake and look for leaks.

 

agreed, ^^^^^^ would also quit driving it until you find the culprit, if its a manifold or similar leak, you might liquefy the top of a piston or valve seat/valve

 

Thanks. I hope to find it soon. Its been a good truck. Up until a few days ago it was still a daily driver of 200 miles a day.

 

It was a vacuum leak. The 90 degree elbow on the back of the air intake manifold was split. Simple fix but hard to find. Thanks for your help

 

called it!

Glad you found it!