just replaced the intake gasket and plugs, on 97 lumina.. the engine idles good runs good, but on take off its seems slugish or flat, could it be the injectors?

any check engine light on?

any check engine light on?
check engine lights not on.. i put some injector cleaner in today, could it be the temp sending unit.. i should have replaced it.. i know on the silverado i had when the temp sending unit went bad it would act up.. but i would get some black smoke out the tail pipe..the check engine light is not working must be burn out.. stoped at auto zone the checked it and said its a miss fire on #5 cylinder. checked the wire with omn tester its ok plugs are new..