Changed trottle poision sensor trottle body gasket checked for vacum leaks none found checked electral connections cleaned reconnected checked for fault codes none this started after washed engine what sould I check next?
Apparently no one has ever told you that you should NEVER wash an engine. There are far too many electronic components and modules in there.
First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.