i have a 1988 gta zz4 350 crane 2032 cam rooler rockers 10.5 to 1 compression walbro fuel pump 50 psi fuel pressure with 22lb/hr injectors headers 3 inch exaust accel runners stock ported base plate ,6 deg base timing hyper tech stage 2 chip, put 58 mm tb on and lost tons of power any ideas ?

 

TPS set incorrectly? I don't recall exactly, but I think the 88 still uses the touchy "external arm" TPS, which is easy to set wrong.

And an off-the-shelf chip is unlikely to give optimum results when you start changing things as significant as a cam.