Timing belt may have skipped a coupla teeth. That's all it takes to mess up a smooth running engine. Timing belt AND related components replacement is called for before it hits 130K miles. don-ohio (:^)
Have you cleaned the throttle body and throttle body valve? have you cleaned the idle speed control air bypass valve? are the injectors clean? Are there any fault codes in memory, do the things I mentioned if you haven't already. Also hard engine mounts can cause roughness at idle. Another thing is the timing belt tight?
SOURCE: My 1999 Ford 4.0 has a hard miss at driving speeds
you probably have a vacuum leak and by the sound of it, it idles rough with the brake pedal depressed its your brake booster
SOURCE: 2000 FORD ESCORT WONT IDLE
on the sohc engine there is a rubber elbow on back of the valve cover going over to a line at the fuel injection that cracks at about 100K miles and lets the engine **** air and it will idle horrible til you fix it. Check this and see if it's not your problem...I've had it happen to 3 sohc engines and the dealer wanted $400 to fix the first one for my friend...Took about 30 seconds to pop the hood and pull it off, 3 minutes to glue it back together, an hour to dry, and 30 seconds to reinstall it...
SOURCE: My 2003 Ford Escort ZX2
2003 zx2,rough idle when stoped and the car in drive,runs fine on open road,while idleing i opened the hood,when i loosened the oil fill cap i heard a pufffff,like a relief valve,it should not be building pressure should [email protected],please
SOURCE: 2003 mazda protege idles rough and shakes, almost stalls
What about new spark plugs and wires?
SOURCE: what causes 2000 taurus engine rough idle but no codes
I had a head gasket going when I have a rough idle. Just weeping coolant past the number 1 cylinder. When I pulled the head the piston was all shiny and steam cleaned. $500 dollars all good now.
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