Hi, everyone. I recently brought home a 90 GTA 305 TPI. Was told that the motor was pulled, replaced some gaskets, oil pump, water pump, timing chain, and added headers ( flow-tech) I was told the timing needed adjustment, and that the 02 sensor was not put into the header, that i needed to mount an 02 sensor because the engine light would come on after driving a few minutes, which it does.
The car starts fine and seems to idle ok, But when i get on it, it seems to be bogged down. From say 50 mph, i put my foot into it, it drops down a gear but does not have any strong surge forward. From a dead stop, if i put my foot into it, it lazily goes forward, no chirp, no quick surge forward.
Any suggestions?

Thanks one and all for any and all help.

 

Timing and 02 sensor?

 

start w/ your 02 sensor. then check for codes, then set your timing with the est disconnected to 6 degrees btdc.

 

wait a min, did you say gta tbi? never heard of one,anyway if you have tbi,set timing to 0 degrees