I have a 1998 dodge ram with the 5.2. Recently had a clogged cat, did exhaust work to it, and then this issue started. The RPM's will either suck down really low when I take my foot off and come back up to idle speed, and sometimes the motor will simply stall. Replaced Idle air control and TPS already, before the cat clogged up it ran perfect. Help??

 

i went through something like this too when my battery died and i jumped it. before it died it would idle around 1200 rpm and now it idles pretty low at 400 to 600. it no longer stalls out. im not exactly sure what the issue is so im gonna stay tuned to this thread

 

Did you clean out the IAC port out good?

Did you disconnect battery when you changed out IAC and TPS?

 

One thing I have noticed over the years with my truck is if the battery is weak it will do this. However, for the OP, x2 on gdstock.

 

Battery and alternator are brand new, this ones got me stumped, haha

 

However, I did have to run it for a couple days with just headers imbetween the exhaust work i did.Really hoping my valves aren't gone through

 

have you tried cleaning the Throttle body, and IAC well?

 

Yeah, removed throttle body, and cleaned thoroughly, then threw new iac in

 

And that didn't solve it? If not, test TPS.