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my 2004 lariat crew cab has a rough idle when in drive when stopped. When the a/c is on it is smooth as glass. I am getting nowhere with nthe dealer. Any suggestions?
Could be that the basic idle setting is too low. There was a comment about that in a thread about 4 weeks ago. In that case, they just increased the idle speed and all was OK.
Having the AC on causes a higher idle RPM to be commanded, to compensate for the 'drag' of the compressor. Since it seems to run OK w/ AC on, the computer is calling for a higher idle and bringing it up to where the engine seems smooth.
Give it a shot before anything else...nothing to lose! -Don