You most likely have a vacuum leak from a miss installed plenum, hose, or egr tube.
Four
Four.
When changing the spark plugs of a car, it is important to remember to gap the spark plugs. The gap for this cars spark plugs are 0.051 inches.
Under the Air Intake Manifold.
http://my.is/forums/f67/is300-changing-spark-plugs-340989/
how to change spark plugs on a 2001 expedition
there are four spark plugs.
How do you change the spark plugs in 2001 lexus rx300?
( 8 ) spark plugs
How do you change the spark plugs (or tune up) in a 2001 Infinity I30
Make sure the firing order is correct that you didn't mix up the leads when changing plugs.
You can remove the 2001 Acura spark plugs with a 5/8 deep well socket. Turn the socket to the left to remove the spark plugs. Reverse the process to install the new spark plugs.