I did the wire trick and the only code that comes up is 12...It idles fine but whenever i give it gas it boggs down... sometimes dies

any helpful tips to solve this problem
5.7 1989 k5 blazer

already changed the injectors,dis.cap,router,pcv valve,air idle control sensor,and fuel pump

 

I had the same issue not to long ago, ended up changing the throttle control modd, fixed the bogging issue. now im haven a problem with the truck stalling when in gear, i have an 87 with a 5.7

 

you can check the egr valve. ive seen them go bad where they open wide open at idle and cause a major vacuum leak and cause the engine to die out at idle. probably gonna need to people, the last truck i worked on it didnt do it at idle, had to put it in gear and give it a hair of gas

 

Have you replaced the fuel filter or the coolant temperature sensor? Common fixes for a problem like yours.

 

i changed the fuel filter and coolant temp. sensor and the same problem is happening....

anymore ideas..ill try about anything

 

Fuel pressure in spec (9-11psi)?
MAP sensor reading properly?
TPS sensor reading properly (~0.5V at closed throttle & smooth transition up to ~4.5V at wide open throttle)?
EGR valve operating properly (as previously mentioned)?

 

Well i got the truck running great...but whenever im in gear and give it gas it has no power the truck barely moves even though it runs great