Just an update about the MAF on my '99 F-150 4.2L, 120K miles I reported about in December. Remember I had posted a thread about my MAF going out and that Ford told my mechanic that the AirRaid system was the culprit. I spoke directly with AirRaid and they assured me that the system was not the culprit but that I might possibly but very unlikely though could get some excess oil from the filter on the MAF causing it to act up and that it could be cleaned. However, I ended up needing a Throttle Position sensor and a couple of vacuum hoses in addition to my MAF. Truck ran great about 28 days. Last week when I started it one cold morning, it turned over and died. I cranked it again and it sounded like it was sucking in tons of air like a vacuum leak or something. Idles rough. I need to keep giving it gas to keep the rpms up during stops. about 10 to 20 miles later "vacuum leak" sound and bad idle stops and it runs great. I took it back to my mechanic and he immediately targeted my MAF again saying that it was the AirRaid system. They replaced the MAF again for free. I told them that I wasn't buying the whole intake system being the problem. The next morning it did the same thing again. I spoke to a different shop - Ford Performance Specialists (FPS). I explained to him what was happening. He didn't believe it was m intake system either. He said it was probably my IAC and/or another vacuum hose leak. I cleaned my IAC - no luck. I replaced my IAC. It still died on first start. So I put my original IAC back on. Does anyone have any suggestions. I would like to fix it myself before I take it to FPS.

ANy insight to this crazinees would be much appreciated.

Ralph
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Yikes! Man that sounds like a heck of a problem. What about electrical? Like maybe a fuse or a relay?