OK. Checked converter, and vacuum stayed up untill engine just about dies, seemed ok, I changed the 2 o2 sensors because of the code and the code has stayed off for 50 miles so far, , after you drive on the highway, and come to rest, if you idle for a while, it slowly starts to lower in rpm, not quick or fast, just real slow, till you hear the IAC start screaming for air, if you tap the throttle it stops for a few seconds, I noticed if you hold the throttle open to about 1500 or a little more it will start surging, almost like a race car sound with a cam, it has a dieseling odor at that time, but just past that on the throttle it smooths out, it almost sounds like a tps, but I have no code for that, I checked it with the scan tool and it showed to be good, what about timing chain, it has never been replaced, , would the timing of the cam to the crank, be off so much this could be happening?I know it needs one just looking for any other thoughts, also the fuel pump is perfect 49--50 all the way till it dies, I watched the counts on the IAC and they drop when the engine is dying, do you think the IAC cant hold the idle. Thank you for all your help
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Thursday, August 7th, 2008 AT 5:21 AM