Even
if the fuel pump strainer needed to be replaced, there is an access door under the back seat. You could get to it fairly easily there.
Check the wires and plugs. I chased a stumbling problem around my engine compartment last month. I wasn't throwing a CEL so I had no clues to go off of, just that it felt like timing. I even went so far as to check the alignment of the cams! The exhaust cam was off a tooth, but it didn't change the stumbling. I kept ruling out my new (in Jan) MSD wires. Just for ****s and giggles I tried a new set of Autolites and the car ran perfectly. The only time it will stumble now is if I am in traffic, the car is hot, and the intake gets heatsoaked (no bottom on the airbox).