'97 Voyager - Hesitation when giving it gas

Hi all. 1997 Voyager, 2.4L, 110k miles.

When giving it more than 1/4 throttle the engine is hesitating. Fuel pump is less than 2 years old, and 2 months ago I changed the plugs and air filter on this vehicle. My teenager brought it home this way with the CEL on...stupid me I didn't use the key shortcut to read it...since the battery cables had some corrosion on them, I cleaned them (thinking that may have been the problem) thus clearing the CEL light. One note though...I never had any exhaust work done on this vehicle. I suspect a clogged cat, since the symtoms are similar to other cars I've owned that needed one.

Will the Autozone service that reads codes read stored codes also? Or should I drive it around awhile and wait for the CEL light to go on and then get the codes read?

**edit** Actually...I never tried the ignition shortcut with this vehicle...my odometer is digital (if it matters)...will the on-off-on-off-on cycle work?

I would probably wait till came back and get the codes . Catalyst very rarely clog up so I wouldn't lean that way ,could be something like an O2 sensor though. First I would go out and get a good fuel system (not injector) cleaner Techron or Gumout) , get a couple of bottles and run it thru the next couple tanks to rule out dirty fuel system . Also it would be a good idea to clean the throttle body with some good throttle body spray cleaner . Work from there until the codes show up again . The keydance method of getting codes should work fine on that era.

Just an update...I never did get the CEL light to show up again. However...I had changed the plugs on my van over a month ago and never changed the wires. I slapped a new set of wires on there and now she runs like a champ. The resistance on the old ones (2 years old) must have been really bad!