i have a lsvtec with 11.9cr built haead with 63403 cams. i have a aem fuel rail and stock gsr injectors. my fuel pressure is at 80, when i turn it down the car do not rev, like its not geting enough gas or to much. what can be the problem.

 

How much psi did you reduce it by? Just a guess but perhaps your injectors are clogged. Running at 80PSI there was no problem but tuning it down caused it not to be able to force the fuel through any gunk inside.

I would wait for other opinions. I'm tired, and probably wrong haha. I hope you find out what it is though.