My 2000 Mer Sable LS Prem w/ 62,500 miles has been a great car.

Just recently replaced the battery but that has been the only problem.

I''ve been noticing a slight stumble or hesitation at idle but it was not very noticeable.

Tonight while driving home in traffic the hesitation was more noticeable and the engine light came on.

It still drove fine on the way home.

Do this sound like a fuel filter problem?

First things first. Pull the code out of the computer and see what that brings. O.K? Let me know.

P0171 & P0174 (lean)

Lat night I was working on it and get a sharp high RPM miss at around 4,000.

Thanks

4000 rpm in park or neutral?

It was neutral.

Userday I took it over to a fleet maintenance company and they ID the problem right away. There''s a vacuum tube on the bottom of the intake area just behind the throatal plate. You can''t see and have to locate it by hand.

He said that ford truck have a similar tube.

Thanks