Didn't believe her..

[NoSparkNeeded]

My wife kept saying her car was losing power. She is a very "gentle" driver. I thought perhaps she was not nailing the throttle hard enough. She also complained about roughness at idle. Everytime I drove the car, it was perfect.I drive all my vehicles in a "spirited" manner. I told her "unless I can re-create the problem, or you can, I cannot fix it". Well today, I took her car on a bunch of errands. It did indeed misbehave. I was going along OK up a slight incline. The car would not respond to the throttle. Mashed it and got a downshift but no acceleration. Stopped at a stop sign. Took off, and did an "italian tune up". Everything was fine. Did the rest of my errands. Pulled into the garage, but the car idled rough. Went back out and all was fine again. I suspect the tank screen. Changed the filters about a month ago. They look OK. Fuel sender stopped working last month and I cleaned a good bit of black stuff out, and got it working again. Added a can of Seafoam two days ago. Think that will clean the tank screen, or am I going to have to make a mess and pull it?