Originally Posted by livinlifes2short
Hey guys new here and did a search found our post, I am having the same problem, i just replaced my fuel pump a month ago and this was happening before and after, sounds like a have a dang turbo makes a loud sucking noise from the throttle body area and idle drops some times it will pick back up or I have to give it gas a few times for it to fix its self, or like he said put it in gear. Makes me think that its the IAC valve is there any way to test this without a computer? Or any other good thoughts?? Thanks 97 5.9 ram sport
i was thinking the same thing... IAC. the sucking problem can be the IAC adjusting, letting in more air to adjust the idle. and then when in gear, there's a load on the engine and ecm may have already adjusted with more fuel. if there is too much carbon around the IAC, that can cause issues too. if the AFR requires more air (according to what O2 reading during closed-loop), ecm will try adjust the IAC to fix it. well, too much carbon may not let the proper air get thru and now the IAC, O2, ECM are all fighting to get the engine to run right. oh, and include MAP sensor in there too. i'd remove the IAC and make sure it's nice n clean and the ports associated with it are spotless. i had a plymouth that was PICKY!!!! did a lot of short driving and had to clean the IAC almost every other oil change. otherwise, it would Idle like CRAP. and don't even think about turning on the A/C. the extra load was enough to put it over the edge and kill the engine.