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Message: <blockquote data-quote="DAM Sport Trac" data-source="post: 1048243" data-attributes="member: 76293">If you have eliminated the ignition (plugs, wires, coil pack) Check the injector oring (cyl#1) and intake seals. With engine running, spray a blast of carb clean at the port where the injector is pushed into the intake. If there is a change with the idle the o-ring on the injector is leaking. Then spray the carb clean around the mounting surface of the intake (upper and lower). Be careful to keep the spray from getting into the injector seal areas or you could confuse one for the other as leaking if you get a change in idle. It that doesn’t show any change, check throttle body gasket with the spray. Then check maf sensor next. Much easier with a scan tool because you can use the o2 readings and rpm’s  to pick up very small leaks that you may not “feel” the change. You will also be able to check the performance of the o2’s and maf to rule them out or in as the cause.</blockquote>