cantfind2nd

iTrader: (24)

Have a modded 2002 z28 ms4 cam,ported heads,long tubes.... Acts like its missing at idle,low power,stumbles or stalls. Can press gas pedal and nothing happens. Comes out of it if you go to wide open. Was tuned by tsp. Its missing the b2 s2 oxygen sensor simulator? But ive been told tsp tunes that out and i shouldnt need it? Throws no codes. But check engine light flashes at me sometimes. Will drop power intermittently,under light throttle cruising rpm. Seems to run better or come outa it with rpm. Will go days running fine. Then with no warning runs like ***. Any ideas? Where do i start? Just replaced both 02 sensors.... Used bosch universal ones... Any problems with them?thanks for any help.