today when i turned my car on, it had to turn over for like 5 seconds before it started.... when i started to drive it, i noticed that it was hesitating a little bit and my a/f gauge was reading lean when i was on the throttle. when i was just driving with a steady throttle % ( on the afc), the a/f gauge was in stoich like its supposed to be. it was only when i increased the throttle % that the gauge went lean

now i have a walbro 255 lph fuel pump and lucas 440s (i normally run rich)
i checked the spark plugs and they arent fouled out
my ecu isnt throwing any codes

the only thing i can think of is maybe my injectors are clogged (ive had them for about a year)
what do you guys think and if that is the case... how much does it cost to have them cleaned?