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  1. S

    4.0 Rebuilt engine - Rough Ide

    I cleaned the MAF sensor and IAC today. The MAF looked brand new ! I bought MAF cleaner and also used it on the IAC. The IAC was very dirty - oily and I look in the intake manifold with a flashlight and it looked the same - dirty oil was covering the inside walls of the intake manifold...
  2. S

    4.0 Rebuilt engine - Rough Ide

    Thanks .... I might just take it to the dealer. I think they have more sophisticated dianogics equipment then my local mechanic.
  3. S

    4.0 Rebuilt engine - Rough Ide

    Okay... thanks for the suggestion. I might just buy a new IAC, looks like I can buy a motorcraft around $75.00 from Rock Auto
  4. S

    4.0 Rebuilt engine - Rough Ide

    Hello, I had my 96 Explorer 4.0 liter engine rebuilt a few months ago with 240K miles. Since the rebuilt, it ihas always idled very rough. The engines seems smooth while driving and over about 1200 RPM's. I replaced the fuel filter, had the vacuum check lines checked out - no leaks. I ran...
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