Hello i am new to this

i have a 2005 sportsman 700 efi

changed fuel pump for a cater , pressure with pressure gauge constant abt 39 pounds motor running

but engine is cold , starts ok rpm abt 1100, but when i increase throttle to abt 2500 to 3000 rpm it tends to bog down , and recovers at about 3500 rpm

when notmal temp attained seems ok and throttle respond well enough

thanks for you help all of you