i have a 1998 dodge ram 1500 5.2 V8.
last night on the way to work i noticed when i let off the gas the RPMs would drop way low,almost low enough to kill it but not quit...got to work shut it off and cranked her over again,would crank rite over run for a second and the RPMs would drop and she would die,only way to keep it running was to keep my foot on the gas,i let it sit for awhile went out and cranked her over,again crank rite up and i had to keep my foot on the gas but this time i let up and she stayed running,shut it off and did it again this time no gas needed she stayed running and idled normal...now on my way home while driving the truck died every time i let off the gas no matter if i was stopped,going down a hill or whatever,she would just die...got up this mornign went out started her up...no problems,idled fine,rev it up she would drop down and idle rite where it needed to be...i am clueless when it comes to working on a vehicle and have no idea what would cause this..some suggestion i have herd are the throttle control sensor is going out,fuel filter clogged{but i would think if the filter was glogged it would die when i gave it gas not when i let up}...any tips or hints or anything as to why this happend?...past few weeks i have noticed the RPMs dropping way low when i let up off the gas but it never caused it to die,some days it would do it some days it wouldnt...she would drive normal for a bit then start doing it again and i have also noticed that some times when i turn the key the RPMs will jump way up{never noticed that before} and again it wouldnt do it all the time......do yall think it is the TPS? being this close to the holidays im on a very limited budget and do nto have the time or money to take it in and have it looked at..hoping osmeone here has had this problem before and tell me how to fix it? thanks folks.

 

anybody???

 

sounds like either your IAC has gone bad or it needs a good cleaning... pull off the TB and IAC and clean it real good. if that doesnt fix it then you need a new iac. the IAC is on the back of the throttle body.

 

My vote is for the cleaning of TB and IAC also

 

appreciates the replys....ill pull the TB today and clean the IAC,might as well take the battery in as well and have it checked...did a little digging on here and seems some wierd things can happen with a weak battery with these dodges..thank you

 

welp i pulled the TB cleaned IAC{real dirty by the way} cleaned throttle body real good and replace teh TB gasket and the gasket that sits under the air cleaner and it seems to be running fine now.....idles better than it did the day i bought it..no rev problems and the idle doesnt drop way down when i let off the gas.....hopefully its fixed now..thanks folks.

 

well i thought that fixed the problem....not as bad now but it is still doing it...seems to be worse when its cold out as the day warmed up i had less and less problems with it....drivin me crazy.

 

Did you check to make sure the IAC is actually working?

 

honestly i dont know how to check to see if its working????? if i was to take it to a mech would a diagnostics test tell? does that have a code?...like i said i dotn know much at all about working on a vehicle all trial and error.

 

Is real easy. First remove the IAC from the throttle body. With it still plugged in turn on the ignition. You should see it move in, Shorten. I used a mirror to see it from inside the cab, or a buddy watch it. If there is no movement then replace the IAC valve. I just had similar problems and replaced my IAC and it now runs great.