Idle rises to 4000rpms on tickover.changeg full top manifold,including throttle,air intake,checked for airleakaround plenim,air hose,ect
SOURCE: idle too high +goes higher when put in gear (manual transmision
IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.
SOURCE: 1997 buick lasabre custom
It sounds like you have a vacuum leak or intake gaskets leaking. Try this. Start the engine and let it reach the idle it want to go to. Get you a can of Brake Clean and spray it around the intake manifold (it on the top center of the engine, you may have to removed a plastic cover) If the engine idle changes up or down then the intake gaskets are leaking hence your vacuum leak. I hope this will help you.
SOURCE: Oil in the intake manifold air hose...
This is usually an indication of "blowback" caused by worn piston rings. How many miles on the engine? There is not a cheap solution if it is blowback.
SOURCE: focus 1.4 zetec idle tickover is about 2000rpm
sensor problem,without the right equipment it will be cheaper to put it in the dealers
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