here is waht i no ticed when i had a scaner on it. the IAC starts to close gently like normal but as soon as the map sensor reads the dip in vacumme (19" hg on decalleration) the IAC then closes all the way and my idle drops to 500 it sergises a bit and idles at normal agian at 850 rpm. some times it stalls.

so any idea what could be cousing this? we are stumped

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

got the same problem with my 06 gp gt. mine was running rough though and had to push to get it going. so i seafoamed it it fixed the acceleration problems but it still shakes a little at idle or stop and sometimes the rpm drops then comes back up it could be the pcm at fault or the sensor if you find more info please let me know.

I was having the same problem with mine for a while. The intake air temp sensor was not making contact. One of the pins in the 5 to 5 wire adaptor had pushed out. I replaced the adaptor and things are much better now.

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39# inj, LQ4, FWI, Jardine exh, OBX hdrs, PT, AL104s, PRJ Wires, DEI boots, 180 stat, 3.4 MPS, MSP poly eng mnts, F&R STBs w/ DR brkts, poly sway bar bushings, painted tails, SPO grills, spoiler & tips

well it's still doing it. tuned my idle lower so it would not stall any more. looks like the IAC shuts when i let off the throttle. looked for vac leaks and there are none. other then that the car drives fine

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

MAF. Everytime I had issues with my MAF my car did the same B.S.

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