Help turbo 2 problems
 

1987 t2. At 3800 rpm the turbo tries to engage but want. If you try and give it gas without the turbo engaging. It will rev fine. Have done a lot of work new tank, pump, lines, fuel filter, oil filter. Spark plugs, wires. Few other things. Doesn't over heat.
https://cimg5.ibsrv.net/gimg/www.rx7...9a78d041e3.jpg

Clogged or cracked secondary injectors possibly?

Confirm fuel pressure and start inspecting your secondary injectors and the wiring to them.